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# Exercise Title Features Description Platform Keywords
1 Concatenando Caracteres de Dos Strings (Caso 1) Construya un programa que tenga una función que reciba dos strings y devuelva un string formado a partir de los... PCEX strings
2 Concatenando Caracteres de Dos Strings (Caso 2). Construye un programa que tenga una función que reciba dos strings y devuelva un string formado a partir de las... PCEX strings
3 String Concatenation (Case 1) Construct a program that prints the text "24 and 45 concatenated: 2445" and "24 and 45 added: 69". PCEX strings
4 Accessing String Characters (Case 1) Construct a program that prints the 1st, 9th, and the last character of the string "String Example!". PCEX strings
5 Accessing String Characters (Case 2) Construct a program that prints the 7th, 11th, and 14th character of the string "Second Example!". PCEX strings
6 String Comparison (Case 1) Construct the program that first checks the equality of the strings "HELLO WORLD!" and "hello world!" and then modifies the... PCEX strings
7 String Comparison (Case 2) Construct the program that modifies the string "hexxo worxd!" so that it matches (ignoring case) the string "HELLO WORLD!". PCEX strings
8 String With Escape Characters (Case 1) Construct a program that prints the following output:\n"Quotes"\nSlashes\n\//\nHow '"confounding' "\" it is! PCEX strings
9 String With Escape Characters (Case 2) Construct a program that prints the following output:\n""Two Double Quotes""\n Slashes \//\nHow '"confounding' "\" it is! PCEX strings
10 String With Escape Characters (Case 3) Construct a program that prints the following output:\n"Slashes"\\//\n \\//\nHow '"confounding' "\" it is! PCEX strings
11 Printing Name Initials Construct a program that prints the initials of the name "John Smith". PCEX strings
12 Printing Name in APA Style Construct a program that prints the name "Alice Ann Darcy" following the APA style, i.e., last name first, followed by... PCEX strings
13 2-21_StringDemos Java BehaviorExample for demonstrating 2-21_StringDemos AnnEx strings
14 Char Strings (Memphis) Some demos of working with the char and String data types. AnnEx strings
15 Creating String Creating String AnnEx strings
16 String Length String Length AnnEx strings
17 String Example StringExample AnnEx strings
18 Strings (charAt) Java BehaviorExample for demonstrating Strings (charAt) AnnEx strings
19 Strings (equalsIgnoreCase) Java BehaviorExample for demonstrating Strings (equalsIgnoreCase) AnnEx strings
20 Strings (parse) Java BehaviorExample for demonstrating Strings (parse) AnnEx strings
21 Strings (replace) Java BehaviorExample for demonstrating Strings (replace) AnnEx strings
22 Substring Substring AnnEx strings
23 Strings Python CodeVisualization for demonstrating Strings JSVEE strings
24 Crear una función que verifique si una cadena es un palíndromo o no Construye una funcion que determine si la cadena dada como parametro es un palindromo. La funcion debe ser insensible a... jsParsons strings
25 Crear una función que verifique si una cadena es un palíndromo o no Construye una funcion que determine si la cadena dada como parametro es un palindromo. La funcion debe ser insensible a... jsParsons strings
26 String Indexing Construct a program that first prints out strings "Py", "th", "o", and "n" jsParsons strings
27 Practicar el corte de cadenas (slicing) Construye un programa que primero imprima las cadenas "Py", "th", "o" y "n" jsParsons strings
28 String join Construct a program that prints out a sentence from a given list of words. jsParsons strings
29 f-string format 1 Python CodeVisualization for demonstrating f-string format 1 JSVEE strings
30 f-string format 2 Python CodeVisualization for demonstrating f-string format 2 JSVEE strings
31 Palindrome Python CodeVisualization for demonstrating Palindrome JSVEE strings
32 q_py_aliasing3_es Python PredictingFinalResult for demonstrating q_py_aliasing3_es QuizPET strings
33 q_py_concat_strings1_es Python PredictingFinalResult for demonstrating q_py_concat_strings1_es QuizPET strings
34 concatenate strings Python PredictingFinalResult for demonstrating concatenate strings QuizPET strings
35 f-string formatting 1 Python PredictingFinalResult for demonstrating f-string formatting 1 QuizPET strings
36 f-string formatting 2 Python PredictingFinalResult for demonstrating f-string formatting 2 QuizPET strings
37 f-string formatting 3 Python PredictingFinalResult for demonstrating f-string formatting 3 QuizPET strings
38 f-string formatting 4 Python PredictingFinalResult for demonstrating f-string formatting 4 QuizPET strings
39 q_py_output2_es Python PredictingFinalResult for demonstrating q_py_output2_es QuizPET strings
40 String Formatting V1 Python PredictingFinalResult for demonstrating String Formatting V1 QuizPET strings
41 String Formatting Python PredictingFinalResult for demonstrating String Formatting QuizPET strings
42 String Formatting 1 Python PredictingFinalResult for demonstrating String Formatting 1 QuizPET strings
43 String Formatting 2 Python PredictingFinalResult for demonstrating String Formatting 2 QuizPET strings
44 q_py_str_ref1_es Python PredictingFinalResult for demonstrating q_py_str_ref1_es QuizPET strings
45 q_py_substring1_es Python PredictingFinalResult for demonstrating q_py_substring1_es QuizPET strings
46 substring Python PredictingFinalResult for demonstrating substring QuizPET strings
47 Strings Basics Python BehaviorExample for demonstrating Strings Basics WebEx strings
48 Sub-Strings Python BehaviorExample for demonstrating Sub-Strings WebEx strings
49 Adding Strings Python BehaviorExample for demonstrating Adding Strings WebEx strings
50 Escape Characters Python BehaviorExample for demonstrating Escape Characters WebEx strings
51 Finding character in a string Python BehaviorExample for demonstrating Finding character in a string WebEx strings
52 Concatenating Characters of Two Strings Construct a program that has a function that receives two strings and returns a string formed from the given strings... PCEX strings
53 Concatenating Strings and Numbers Construct a program that uses variables x, y, and z to print "Python was invented in 1989.". PCEX strings
54 Concatenating Characters of Two Strings Construct a program that has a function that receives two strings and returns a string formed from the given strings... PCEX strings
55 Concatenating Strings and Numbers (Case 2) Construct a program that uses variables x, y, and z to print "x * 2 = 4". PCEX strings
56 Concatenating Strings and Numbers (Case 3) Construct a program that uses variables x, y, and z to print "10 + 20 = 30". PCEX strings
57 String Concat Java PredictingFinalResult for demonstrating String Concat QuizJET strings
58 Different Ways to Print Python BehaviorExample for demonstrating Different Ways to Print WebEx strings, variables
59 Given a string s and an integer n, return a string in which each of the characters in s is repeated n times. Code Completion Given a string s and an integer n, return a string in which each of the characters in s is... CodeCheck Strings, Other String Operations
60 Given a string s, return the first vowel that is doubled in the string. Code Completion Given a string s, return the first vowel that is doubled in the string. CodeCheck Strings, Other String Operations
61 Given a string s, return the string with adjacent duplicates removed. Code Completion Given a string s, return the string with adjacent duplicates removed. For example, Mississippi yields Misisipi. CodeCheck Strings, Other String Operations
62 Given a string s and a string t, return a string in which all the characters of s that occur in t have been replaced by a _ character. Code Completion Given a string s and a string t, return a string in which all the characters of s that occur... CodeCheck Strings, Other String Operations
63 Given a string, return a string composed first of all characters at even positions and then of all characters at odd positions. Code Completion Given a string, return a string composed first of all characters at even positions and then of all characters at... CodeCheck Strings, Other String Operations
64 Write a method that undoes the effect of the preceding exercise. Code Completion Write a method that undoes the effect of the preceding exercise. CodeCheck Strings, Other String Operations
65 Given a string and two characters x and y (as strings of length 1), interchange all occurrences of x and y. Code Completion Given a string and two characters x and y (as strings of length 1), interchange all occurrences of x and... CodeCheck Strings, Other String Operations
66 Given a string s and a character c (as string of length 1), return a string with the characters surrounding the first occurrence of c reversed. Code Completion Given a string s and a character c (as string of length 1), return a string with the characters surrounding... CodeCheck Strings, Other String Operations
67 Given a string s and a character c (as string of length 1), return a string with the characters surrounding any occurrence of c reversed. Code Completion Given a string s and a character c (as string of length 1), return a string with the characters surrounding... CodeCheck Strings, Other String Operations
68 Given two strings s and t, return the first position where their characters differ, or -1 if they are identical. Code Completion Given two strings s and t, return the first position where their characters differ, or -1 if they are identical. CodeCheck Strings, Comparing Strings
69 Given two strings s and t, return the first position where their characters are the same, or -1 if there is no such position. Code Completion Given two strings s and t, return the first position where their characters are the same, or -1 if there... CodeCheck Strings, Comparing Strings
70 Given a string s, count how many times the ith character from the front equals the ith character from the back. Code Completion Given a string s, count how many times the ith character from the front equals the ith character from the... CodeCheck Strings, Comparing Strings
71 Given strings s and t, return a list of all positions in which t occurs in s. Code Completion Given strings s and t, return a list of all positions in which t occurs in s. CodeCheck Strings, Finding Substrings
72 Given strings s and t, return a string in which all occurrences of t are removed from s. Code Completion Given strings s and t, return a string in which all occurrences of t are removed from s. CodeCheck Strings, Finding Substrings
73 Given strings s and t, return a string in which all characters in t are removed from s. Code Completion Given strings s and t, return a string in which all characters in t are removed from s. CodeCheck Strings, Finding Substrings
74 Given a string s, return the longest prefix that is repeated somewhere else in the string. Code Completion Given a string s, return the longest prefix that is repeated somewhere else in the string. CodeCheck Strings, Finding Substrings
75 Given a string s, find the longest prefix that also occurs at the end (so that s = p + t + p), and return t, the string without the beginning and the end. Code Completion Given a string s, find the longest prefix that also occurs at the end (so that s = p +... CodeCheck Strings, Finding Substrings
76 Given a string, return the string with the first and last characters swapped. Code Completion Given a string, return the string with the first and last characters swapped. CodeCheck Strings, No Loops
77 Given a string, return the string with the middle two characters removed if it has even length, and the middle character removed if it has odd length. Code Completion Given a string, return the string with the middle two characters removed if it has even length, and the middle... CodeCheck Strings, No Loops
78 Given a string, return the string with the middle two characters swapped if it has even length, and the middle three characters swapped if it has odd length. Code Completion Given a string, return the string with the middle two characters swapped if it has even length, and the middle... CodeCheck Strings, No Loops
79 Given a string, return the string with the first and second half swapped. Code Completion Given a string, return the string with the first and second half swapped. If the string has odd length, leave... CodeCheck Strings, No Loops
80 Given a string, return the string with the first half and the second half doubled. Code Completion Given a string, return the string with the first half and the second half doubled. For example, Java becomes JaJavava... CodeCheck Strings, No Loops
81 Given a string, find the first integer inside and return its value as an integer. Code Completion Given a string, find the first integer inside and return its value as an integer. Return 0 if there is... CodeCheck Strings, Numbers in Strings
82 Given a string, find the sum of all integers inside. Code Completion Given a string, find the sum of all integers inside. Return 0 if there is no integer inside. CodeCheck Strings, Numbers in Strings
83 Given a string, find all integers inside and return a string that separates them by commas. Code Completion Given a string, find all integers inside and return a string that separates them by commas. CodeCheck Strings, Numbers in Strings
84 Given a string in which words are separated by spaces, return the longest word. Code Completion Given a string in which words are separated by spaces, return the longest word. CodeCheck Strings, Words
85 Given a string in which words are separated by spaces, return the first word that is duplicated (such as an accidental “this this”. Code Completion Given a string in which words are separated by spaces, return the first word that is duplicated (such as an... CodeCheck Strings, Words
86 Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the string. Code Completion Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the... CodeCheck Strings, Words
87 Given a string in which words are separated by spaces, and two words a and b, interchange all occurrences of a and b. Code Completion Given a string in which words are separated by spaces, and two words a and b, interchange all occurrences of... CodeCheck Strings, Words
88 Strings With Escape Characters Construct a program that prints the following output:\n"Quotes"\nSlashes\n\//\nHow '"confounding' "\" it is! PCEX string operations, strings
89 Strings 1 Java PredictingFinalResult for demonstrating Strings 1 QuizJET string, string operations, strings
90 Strings 2 Java PredictingFinalResult for demonstrating Strings 2 QuizJET string operations, strings
91 Strings 3 Java PredictingFinalResult for demonstrating Strings 3 QuizJET string operations, strings
92 Strings 4 Java PredictingFinalResult for demonstrating Strings 4 QuizJET string operations, strings
93 Strings 5 Java PredictingFinalResult for demonstrating Strings 5 QuizJET string operations, strings
94 Strings 6 Java PredictingFinalResult for demonstrating Strings 6 QuizJET conditionals, data types, string operations, strings, variables
95 Given a string, find the first integer inside and return its value as an integer. Code Completion Given a string, find the first integer inside and return its value as an integer. Return 0 if there is... CodeCheck Strings, Numbers in Strings
96 Given a string, find all integers inside and return a string that separates them by commas. Code Completion Given a string, find all integers inside and return a string that separates them by commas. CodeCheck Strings, Numbers in Strings
97 Given a string, find the sum of all integers inside. Code Completion Given a string, find the sum of all integers inside. Return 0 if there is no integer inside. CodeCheck Strings, Numbers in Strings
98 Given a string in which words are separated by spaces, return the longest word. Code Completion Given a string in which words are separated by spaces, return the longest word. CodeCheck Strings, Words
99 Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the string. Code Completion Given a string in which words are separated by spaces, return the first word that is repeated somewhere in the... CodeCheck Strings, Words
100 Given a string in which words are separated by spaces, and two words a and b, interchange all occurrences of a and b. Code Completion Given a string in which words are separated by spaces, and two words a and b, interchange all occurrences of... CodeCheck Strings, Words
101 Given a string in which words are separated by spaces, return the first word that is duplicated (such as an accidental “this this”). Code Completion Given a string in which words are separated by spaces, return the first word that is duplicated (such as an... CodeCheck Strings, Words
102 Given a string, return the string with the first and last characters swapped. Code Completion Given a string, return the string with the first and last characters swapped. CodeCheck Strings, No Loops
103 Given a string, return the string with the middle two characters swapped if it has even length, and the middle three characters swapped if it has odd length. Code Completion Given a string, return the string with the middle two characters swapped if it has even length, and the middle... CodeCheck Strings, No Loops
104 Given a string, return the string with the first and second half swapped. Code Completion Given a string, return the string with the first and second half swapped. If the string has odd length, leave... CodeCheck Strings, No Loops
105 Given a string, return the string with the first half and the second half doubled. Code Completion Given a string, return the string with the first half and the second half doubled. For example, Java becomes JaJavava... CodeCheck Strings, No Loops
106 Given a string, return the string with the middle two characters removed if it has even length, and the middle character removed if it has odd length. Code Completion Given a string, return the string with the middle two characters removed if it has even length, and the middle... CodeCheck Strings, No Loops
107 Given a string s and a character c, return a string with the characters surrounding any occurrence of c reversed. Code Completion Given a string s and a character c, return a string with the characters surrounding any occurrence of c reversed.... CodeCheck Strings, Other String Operations
108 Given a string s and an integer n, return a string in which each of the characters in s is repeated n times. Code Completion Given a string s and an integer n, return a string in which each of the characters in s is... CodeCheck Strings, Other String Operations
109 Given a string s, return the string with adjacent duplicates removed. Code Completion Given a string s, return the string with adjacent duplicates removed. For example, Mississippi yields Misisipi. CodeCheck Strings, Other String Operations
110 Given a string s and a string t, return a string in which all the characters of s that occur in t have been replaced by a _ sign. Code Completion Given a string s and a string t, return a string in which all the characters of s that occur... CodeCheck Strings, Other String Operations
111 Given a string, return a string composed first of all characters at even positions and then of all characters at odd positions. Code Completion Given a string, return a string composed first of all characters at even positions and then of all characters at... CodeCheck Strings, Other String Operations
112 Write a method that undoes the effect of the preceding exercise. Code Completion Write a method that undoes the effect of the preceding exercise. CodeCheck Strings, Other String Operations
113 Given a string s, return the first vowel that is doubled in the string. Code Completion Given a string s, return the first vowel that is doubled in the string. CodeCheck Strings, Other String Operations
114 Given a string s and a character c, return a string with the characters surrounding the first of c reversed. Code Completion Given a string s and a character c, return a string with the characters surrounding the first of c reversed.... CodeCheck Strings, Other String Operations
115 Given a string and two characters x and y, interchange all occurrences of x and y. Code Completion Given a string and two characters x and y, interchange all occurrences of x and y. CodeCheck Strings, Other String Operations
116 Given strings s and t, return a list of all positions in which t occurs in s. Code Completion Given strings s and t, return a list of all positions in which t occurs in s. CodeCheck Strings, Finding Substrings
117 Given strings s and t, return a string in which all characters in t are removed from s. Code Completion Given strings s and t, return a string in which all characters in t are removed from s. CodeCheck Strings, Finding Substrings
118 Given a string s, return the longest prefix that is repeated somewhere else in the string. Code Completion Given a string s, return the longest prefix that is repeated somewhere else in the string. CodeCheck Strings, Finding Substrings
119 Given a string s, find the longest prefix that also occurs at the end (so that s = p + t + p), and return t, the string without the beginning and the end. Code Completion Given a string s, find the longest prefix that also occurs at the end (so that s = p +... CodeCheck Strings, Finding Substrings
120 Given strings s and t, return a string in which all occurrences of t are removed from s. Code Completion Given strings s and t, return a string in which all occurrences of t are removed from s. CodeCheck Strings, Finding Substrings
121 Given two strings s and t, return the first position where their characters differ, or -1 if they are identical. Code Completion Given two strings s and t, return the first position where their characters differ, or -1 if they are identical. CodeCheck Strings, Comparing Strings
122 Given a string s, count how many times the ith character from the front equals the ith character from the back. Code Completion Given a string s, count how many times the ith character from the front equals the ith character from the... CodeCheck Strings, Comparing Strings
123 Given two strings s and t, return the first position where their characters are the same, or -1 if there is no such position. Code Completion Given two strings s and t, return the first position where their characters are the same, or -1 if there... CodeCheck Strings, Comparing Strings
124 Comparing Strings Java PredictingFinalResult for demonstrating Comparing Strings QuizJET boolean expressions, conditionals, data types, string operations, strings, variables
125 String Equals Java BehaviorExample for demonstrating String Equals AnnEx boolean expressions, strings, variables
126 Concat Demo Java CodeVisualization for demonstrating Concat Demo JSVEE string operations, strings
127 String Example Java CodeVisualization for demonstrating String Example JSVEE string operations, strings
128 ToString Demo Java CodeVisualization for demonstrating ToString Demo JSVEE string operations, strings
129 Format 1 Python CodeVisualization for demonstrating Format 1 JSVEE string formatting, strings
130 Format 2 Python CodeVisualization for demonstrating Format 2 JSVEE string formatting, strings
131 Practicar métodos de cadenas Construye un programa que imprima una oracion a partir de una lista dada de palabras. jsParsons list, strings
132 q_py_output1_es Python PredictingFinalResult for demonstrating q_py_output1_es QuizPET operators, strings, variables
133 simple format Python PredictingFinalResult for demonstrating simple format QuizPET string formatting, strings
134 format with one argument Python PredictingFinalResult for demonstrating format with one argument QuizPET string formatting, strings
135 q_py_output3_es Python PredictingFinalResult for demonstrating q_py_output3_es QuizPET operators, strings, variables
136 format with two arguments Python PredictingFinalResult for demonstrating format with two arguments QuizPET string formatting, strings
137 format with three arguments Python PredictingFinalResult for demonstrating format with three arguments QuizPET string formatting, strings
138 Output Formatting Python BehaviorExample for demonstrating Output Formatting WebEx string formatting, strings
139 Output Formatting 2 Python BehaviorExample for demonstrating Output Formatting 2 WebEx string formatting, strings
140 String Index Search Python BehaviorExample for demonstrating String Index Search WebEx search algorithms, strings
141 String Addition Construct a program that prints the text "24 and 45 concatenated: 2445" and "24 and 45 added: 69". PCEX string operations, strings
142 Accessing String Characters Construct a program that prints the 1st, 9th, and the last character of the string "String Example!". PCEX string operations, strings
143 String Comparison Construct the program that first checks the equality of the strings "HELLO WORLD!" and "hello world!" and then modifies the... PCEX string operations, strings
144 Name Initials Construct a program that prints the initials of the name "John Smith". PCEX string operations, strings
145 Repeating Characters of a String Construct a program that has a function that receives a string and creates a new string that has each character... PCEX functions, strings
146 Accessing String Characters (Case 2) Construct a program that prints the 7th, 11th, and 14th character of the string "Second Example!". PCEX string operations, strings
147 String Comparison (Case 2) Construct the program that modifies the string "hexxo worxd!" so that it matches (ignoring case) the string "HELLO WORLD!". PCEX string operations, strings
148 String With Escape Characters (Case 2) Construct a program that prints the following output:\n""Two Double Quotes""\n Slashes \//\nHow '"confounding' "\" it is! PCEX string operations, strings
149 String With Escape Characters (Case 3) Construct a program that prints the following output:\n"Slashes"\\//\n \\//\nHow '"confounding' "\" it is! PCEX string operations, strings
150 Printing Name in APA Style Construct a program that prints the name "Alice Ann Darcy" following the APA style, i.e., last name first, followed by... PCEX string operations, strings
151 Counting the Occurrences of One String in Another Construct a program that has a function that receives a string and returns the number of times that the string... PCEX functions, strings
152 Repeating Characters of a String Construct a program that has a function that receives a string and creates a new string that has every other... PCEX functions, strings
153 Converting String to double Java PredictingFinalResult for demonstrating Converting String to double QuizJET primitive data types, strings
154 Converting String to int Java PredictingFinalResult for demonstrating Converting String to int QuizJET primitive data types, strings
155 String (equals) Java PredictingFinalResult for demonstrating String (equals) QuizJET string operations, strings
156 String (replace) Java PredictingFinalResult for demonstrating String (replace) QuizJET string operations, strings
157 Counting the Occurrences of One String in Another Construct a program that has a function that receives a string and returns the number of times that the string... PCEX for loop, functions, strings
158 Creating a function that checks if the string is a palindrome or not. Construct a function which determines whether the string given as a paramter is a palindrome. The function should be case... jsParsons recursion, search algorithms, sorting algorithms, strings
159 String Concatenation (Case 2) Construct a program that prints the text "333", "63", and "36". PCEX conditionals, data types, string operations, strings, variables
160 Printing Full Name with Middle Initial Construct a program that prints the full name with middle initial for the name "John Phillip Smith". PCEX conditionals, data types, string, string operations, strings, variables
161 if-else 1 Java PredictingFinalResult for demonstrating if-else 1 QuizJET boolean expressions, conditionals, if-else statement, strings
162 Objects 4 (String) Java PredictingFinalResult for demonstrating Objects 4 (String) QuizJET classes, object, objects, strings
163 String Variables Java PredictingFinalResult for demonstrating String Variables QuizJET data types, primitive data types, string operations, strings, variables
164 (Strings) Change case - CSEdPad Given a string, this program converts the string into uppercase and lowercase. present on those variable to either uppercase or... AnnEx string
165 (Strings) String length - CSEdPad Given a string, this program finds out the length of a string. AnnEx string
166 Strings (Concatenation) Java BehaviorExample for demonstrating Strings (Concatenation) AnnEx
167 Strings Review Quiz Question, Battery Strings introduction for CS1 review questions. OpenDSA String
168 Comparing Strings Java PredictingFinalResult for demonstrating Comparing Strings QuizJET boolean expressions, control flow, string operations
169 Variable type: Strings Python BehaviorExample for demonstrating Variable type: Strings WebEx operators, variables
170 Given three input strings, print all but the shortest one. Code Completion Given three input strings, print all but the shortest one. CodeCheck Branches, Branches Without Functions
171 Given a list of strings and a string s, return the average length of all strings containing s. Code Completion Given a list of strings and a string s, return the average length of all strings containing s. CodeCheck Lists - Simple Exercises, Sums, Averages, Products
172 Grammar Construction Exercise: Three Strings Grammar Construction Exercise Exercise where user must write the grammar for a given language. This language has three strings. OpenDSA Language, Grammar
173 Regular Expression Exercise: Strings Containing aba RegEx Writing Exercise User writes an regular expression for the language of strings containing aba. OpenDSA Regular Expression
174 Regular Expression Exercise: Strings of Multiples of 3 a's RegEx Writing Exercise User writes an regular expression for the language of strings that contain a multiple of 3 a's. OpenDSA Regular Expression
175 Regular Expression Exercise: Strings of a's Preceded or Followed by b RegEx Writing Exercise User writes an regular expression for the language of strings where every a is either proceeded or followed by b. OpenDSA Regular Expression
176 Regular Expression Exercise: Strings Containing bba in an Even Position RegEx Writing Exercise User writes an regular expression for the langugae of strings containing bba in an even position. OpenDSA Regular Expression
177 Regular Expression Exercise: Strings of 2 b's and c's RegEx Writing Exercise User writes an regular expression for the language of strings where the number of b's and c's sums to 2. OpenDSA Regular Expression
178 Regular Expression Exercise: Strings of Even Binary Numbers RegEx Writing Exercise User writes an regular expression for the language of strings that are even binary numbers. OpenDSA Regular Expression
179 Regular Expression Exercise: Strings Containing No aa RegEx Writing Exercise User writes an regular expression for the langugae of strings containing no occurance of aa. OpenDSA Regular Expression
180 Regular Expression Exercise: Strings Containing One bbb RegEx Writing Exercise User writes an regular expression for the langugae of strings containing exactly one instance of bbb. OpenDSA Regular Expression
181 Given an array of strings and a string s, return the average length of all strings containing s. Code Completion Given an array of strings and a string s, return the average length of all strings containing s. CodeCheck Arrays - Simple Exercises, Sums, Averages, Products
182 Given three input strings, print all but the shortest one. Code Completion Given three input strings, print all but the shortest one. CodeCheck Branches, Branches Without Functions
183 Creating an Array of Numbers/Strings Construct a program that creates an array of first ten positive odd numbers. PCEX arrays
184 Simple Printing Printing strings and numbers AnnEx variables
185 Zipper words with helper method Code Completion Two strings of equal length can be interlaced like the teeth of a zipper to form a new word. For... CodeCheck Recursion
186 Zipper words Code Completion Two strings of equal length can be interlaced like the teeth of a zipper to form a new word. For... CodeCheck Recursion
187 Insertion Sort reads in Strings and uses insertion sort to print them out in sorted order PCEX
188 Characterizing Languages Exercise 2: Alternate Question Users characterize the strings in the language for a given grammar on palindromes. OpenDSA Language, Grammar
189 Map words to their lengths Code Completion Given an array of strings, create a tree map with each string as a key and its corresponding value the... CodeCheck Tree Structures
190 Map word lengths to words Code Completion Given an array of strings, create a tree map whose keys are the string lengths and whose values are the... CodeCheck Tree Structures
191 ZipperWordGenerator Code Completion You are given two strings of equal length. Your task is to generate all zipper words that can be produced... CodeCheck Recursion
192 CFG Exercise: a^mb^ia^n, i=m+n Grammar Construction Exercise User creates a CFG that generates strings in the language a^mb^ia^n, i=m+n. OpenDSA Context-Free Grammar
193 CFG Exercise: a^mb^ic^n, i less than 3 Grammar Construction Exercise User creates a CFG that generates strings in the language a^mb^ic^n, i < 3. OpenDSA Context-Free Grammar
194 CFG Exercise: Odd length Grammar Construction Exercise User creates a CFG that generates strings in the language a^nb^m where m - n is positive, odd. OpenDSA Context-Free Grammar
195 CFG Exercise: a's and b's are equal Grammar Construction Exercise User creates a CFG that generates strings in the language where the number of a's and b's is equal. OpenDSA Context-Free Grammar
196 DFA Exercise: Length a Multiple of 3 with No aab Automata Construction Exercise User creates a DFA that recognizes strings with length a multiple of 3 and containing no instance of aab. OpenDSA Context-Free Grammar
197 Turing Machine Exercise: Accept Powers of 2 Automata Construction Exercise User creates a Turing machine that accepts strings of a's with the number of characters being a power of 2. OpenDSA Turing Machine
198 Characterizing Languages Exercise 1: Alternate Question Exercise on how to characterize the strings in the language for a given grammar on a's and b's. Alternate version. OpenDSA Language, Grammar
199 Characterizing Languages Exercise 1 Question Exercise on how to characterize the strings in the language for a given grammar on a's and b's. OpenDSA Language, Grammar
200 Characterizing Languages Exercise 2 Question Exercise on how to characterize the strings in the language for a given grammar on palindromes. OpenDSA Language, Grammar
201 Determining Whether a Given String is Derivable from Given Grammar Exercise Question A question where users determine which strings can or cannot be derived from a given grammar. OpenDSA Context-Free Grammar, Parse Tree
202 Context-Free Language Derivations Frameset Programmed Instruction Programmed Instruction Frameset discussing derivations of strings from Context-Free Grammars. OpenDSA Context-Free Language
203 Updating an Element in the Array (Case 3) Construct a program that initializes an array with four strings, changes the last element in the array, and finally, prints... PCEX arrays
204 DFA Exercise: Both Even or Odd Automata Construction Exercise User creates a DFA that accepts the langugage of strings with both even a's and b's, or both odd a's... OpenDSA Deterministic Finite Automata
205 DFA Exercise: b Surrounds a Automata Construction Exercise User creates a DFA that accepts the langugage of strings where every a is surrounded by b's. OpenDSA Deterministic Finite Automata
206 DFA Exercise: Compliment of No 3 a's Automata Construction Exercise User creates a DFA that accepts the langugage of strings of a's and b's that have 3 consecutive a's. OpenDSA Deterministic Finite Automata
207 DFA Exercise: Divisible by 4 Automata Construction Exercise User creates a DFA that accepts the langugage of strings of binary numbers divisible by 4. OpenDSA Deterministic Finite Automata
208 DFA Exercise: Even a's Automata Construction Exercise User creates a DFA that accepts the langugage of strings with an even number of a's. OpenDSA Deterministic Finite Automata
209 DFA Exercise: Even a's, b's, odd a's Automata Construction Exercise User creates a DFA that accepts the langugage of strings with an even number of a's, followed by at least... OpenDSA Deterministic Finite Automata
210 DFA Exercise: Even a, 3 b's Automata Construction Exercise User creates a DFA that accepts the langugage of strings with an even number of a's and at least 3... OpenDSA Deterministic Finite Automata
211 DFA Exercise: Even a's Odd b's Automata Construction Exercise User creates a DFA that accepts the langugage of strings with an even number of a's and an odd number... OpenDSA Deterministic Finite Automata
212 DFA Exercise: No 3 a's Automata Construction Exercise User creates a DFA that accepts the langugage of strings of a's and b's without 3 consecutive a's. OpenDSA Deterministic Finite Automata
213 DFA Exercise: No ba Automata Construction Exercise User creates a DFA that accepts the langugage of strings with a's and b's that does not end in ba. OpenDSA Deterministic Finite Automata
214 DFA Exercise: Odd a's Automata Construction Exercise User creates a DFA that accepts the langugage of strings with an odd number of a's. OpenDSA Deterministic Finite Automata
215 DFA Exercise: Odd a's, 3 b's Automata Construction Exercise User creates a DFA that accepts the langugage of strings with an odd number of a's and at most 3... OpenDSA Deterministic Finite Automata
216 DFA Exercise: Odd a's, Even b's Automata Construction Exercise User creates a DFA that accepts the langugage of strings with an odd number of a's and an even number... OpenDSA Deterministic Finite Automata
217 PDA Exercise: Twice as many a's as b's Automata Construction Exercise User creates a Pushdowns Automata that accepts the langugage of strings that have twice as many a's as b's. OpenDSA Pushdown Automata
218 Regular Grammar Exercise: aaab*ba Grammar Construction Exercise User writes an regular grammar for the language of strings matching the regular expression (aaab*ba)*. OpenDSA Regular Expression, Regular Grammar
219 Regular Grammar Exercise: a's a Multiple of 3 Grammar Construction Exercise User writes an regular grammar for the language of strings with the number of a's being divisible by 3. OpenDSA Regular Grammar
220 Regular Grammar Exercise: Number of a's and b's is Odd Grammar Construction Exercise User writes an regular grammar for the language of strings with an odd length. OpenDSA Regular Expression, Regular Grammar
221 Regular Grammar Exercise: bb*aaa* Grammar Construction Exercise User writes an regular grammar for the language of strings that meet this regular expression: bb*aaa* OpenDSA Regular Expression, Regular Grammar
222 Turing Machine Exercise: Decide Powers of 2 Automata Construction Exercise User creates a Turing machine that decides if strings of a's have a length that is a power of 2. OpenDSA Turing Machine
223 Determining Whether a Given String is Derivable from Given Grammar Exercise: Alternate Calculation Exercise, Battery A collection of self-practice questions where users determine which strings can or cannot be derived from a given grammar: Alternate. OpenDSA Context-Free Grammar, Parse Tree
224 Jison Grammar Exercise 2 Calculation Exercise A question where users calculate the number of strings parsed successfully by a given grammar. OpenDSA Parser Generator
225 DFA Example Trace: Even Binary Numbers Algorithm Visualization, Code Tracing Presentation Visualization of how a DFA would process input strings for the language of even binary numbers. OpenDSA Deterministic Finite Automata
226 Updating an Element in the Array (Case 3) Construct a program that initializes an array with four strings, changes the last element in the array, and finally, prints... PCEX arrays
227 Unique words in two string sets Code Completion Implement a method that receives two arrays of strings and determines which words are unique to each. CodeCheck Tree Structures
228 Reversing a string with StringBuilder Code Completion StringBuilder is another class that provides methods to manipulate strings. Look in the StringBuilder class API for information on the... CodeCheck Objects
229 A slow sorting algorithm with two threads Code Completion Consider the following algorithm to sort an array of strings and remove duplicates, using two threads. CodeCheck Concurrency
230 Picture of Colored Boxes Code Completion Your task is to write a method that produces images from strings describing color values. CodeCheck Loops
231 DFA Exercise: Complement Even a, 3 b's Automata Construction Exercise User creates a DFA that accepts the complement of the langugage of strings with an even number of a's and... OpenDSA Deterministic Finite Automata
232 DFA Exercise: Complement No ba Automata Construction Exercise User creates a DFA that accepts the complement of the langugage of strings with a's and b's that does not... OpenDSA Deterministic Finite Automata
233 Turing Machine Exercise: Palindromes Automata Construction Exercise User creates a Turing machine that recognizes the language of palindromes on strings of a's and b's. OpenDSA Turing Machine
234 Annotating Jison Exercise Tracing Exercise A question where users determine the results of parsing a given collection of strings. OpenDSA Parser Generator
235 Jison Grammar Exercise 1 Calculation Exercise A collection of self-practice questions where users calculate the number of strings parsed successfully by a given grammar. OpenDSA Parser Generator
236 Uppercase international letters Code Completion Your task is to find out what happens when you call the toUpperCase method on strings that contain accented characters... CodeCheck Objects
237 Concatenate elements backwards Code Completion Your task is to concatenate all elements in a linked list of strings backwards, starting at the end of the... CodeCheck Linear Data Structures
238 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches with Functions
239 Letter frequency map Code Completion Your task is to produce a map of the frequencies of all letters in a string. Letters are represented as... CodeCheck Tree Structures
240 Letter set Code Completion Your task is to produce a set of all letters in a string. Letters are represented as strings of length... CodeCheck Tree Structures
241 Generic method for filling an array Code Completion The class below has a static method which sets all elements of an array to a value. The method is... CodeCheck Generic Types
242 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches with Functions
243 Contando las Ocurrencias de un String en Otro (Caso 2). Construye un programa que tenga una función que reciba un string y devuelva el número de veces que el string... PCEX for loop, loops
244 Remove short words Code Completion Remove all short words (that is, words of length at most 3) from an array. Move down the remaining array... CodeCheck Arrays and Array Lists
245 String Concatenation (Case 2) Construct a program that prints the text "333", "63", and "36". PCEX
246 string_compare C++ BehaviorExample for demonstrating string_compare AnnEx
247 string_lib_func1 C++ BehaviorExample for demonstrating string_lib_func1 AnnEx
248 string_to_integer C++ BehaviorExample for demonstrating string_to_integer AnnEx
249 String Comparison String Comparison AnnEx if-else statement
250 String Operation String Operation AnnEx pattern matching
251 String Operation pt This is the portuguese version. AnnEx pattern matching
252 string reference Python PredictingFinalResult for demonstrating string reference QuizPET aliasing, value vs reference
253 String Folding Method activity Calculation, User Supplied Data Calculator for computing value of hashing a string by 'folding'. A better method than character value summing. OpenDSA Hash Function
254 Slanje stringova u funkcije C CodeConstruction&CompletionBundle for demonstrating Slanje stringova u funkcije PCEX
255 find_string C++ BehaviorExample for demonstrating find_string AnnEx
256 DEPRECATED_String Comparison Java BehaviorExample for demonstrating DEPRECATED_String Comparison AnnEx
257 DEPRECATED_String Length Java BehaviorExample for demonstrating DEPRECATED_String Length AnnEx
258 DEPRECATED_StringExample Java BehaviorExample for demonstrating DEPRECATED_StringExample AnnEx
259 Simple String Hash Calculator Calculation, User Supplied Data Calculator for computing value of hashing a string by simple summation of its characters' ASCII values. OpenDSA Hash Function
260 Recursive string reversal with helper method Code Completion Complete the static reverseHelper method so that the reverse method returns a String that is the reverse of the parameter... CodeCheck Recursion
261 Brisanje dijelova stringa C CodeConstruction&CompletionBundle for demonstrating Brisanje dijelova stringa PCEX
262 Detektovanje granica unutar stringa C CodeConstruction&CompletionBundle for demonstrating Detektovanje granica unutar stringa PCEX
263 Mijenjanje karaktera u stringu C CodeConstruction&CompletionBundle for demonstrating Mijenjanje karaktera u stringu PCEX
264 c_trazenje_karaktera_u_stringu Napisati program koji provjerava da li se u datom stringu nalazi određeni karakter. PCEX
265 c_trazenje_karaktera_u_stringu_pokazivaci Napisati program koji pomoću pokazivačke aritmetike provjerava da li se u datom stringu nalazi određeni karakter. PCEX
266 c_funkcija_uporedi_stringove Napisati funkciju koja daje poredak dva stringa po leksikografskom redoslijedu, te vraća -1 ako je prvi string manji od drugog,... PCEX
267 Ubacivanje karaktera u string C CodeConstruction&CompletionBundle for demonstrating Ubacivanje karaktera u string PCEX
268 c_spajanje_dva_stringa Napisati program koji dodaje sadržaj drugog stringa prvom stringu. PCEX
269 c_upis_stringa_u_datoteku Napisati program koji upisuje u datoteku sadržaj datog niza karaktera (varijable niz). Pisanje je potrebno uraditi karakter po karakter. PCEX
270 DEPRECATED_Creating String Java BehaviorExample for demonstrating DEPRECATED_Creating String AnnEx
271 list reference (string) Python PredictingFinalResult for demonstrating list reference (string) QuizPET aliasing, value vs reference
272 q_py_q_py_string_formatting1_es Python PredictingFinalResult for demonstrating q_py_q_py_string_formatting1_es QuizPET
273 q_py_q_py_string_formatting2_es Python PredictingFinalResult for demonstrating q_py_q_py_string_formatting2_es QuizPET
274 Given an input string, print the string with the first and last letter removed if they were equal, or the original string if they were not. Code Completion Given an input string, print the string with the first and last letter removed if they were equal, or the... CodeCheck Branches, Branches Without Functions
275 PDA Exercise: String and Reverse Automata Construction Exercise User creates a Pushdowns Automata that accepts the langugage WcW^R. OpenDSA Pushdown Automata
276 Objects 5 (String) Java PredictingFinalResult for demonstrating Objects 5 (String) QuizJET classes, objects
277 Find vowels in string with recursive helper method Code Completion Complete the MyMethods class so that the static vowels method returns a string of the vowels of the string parameter.... CodeCheck Recursion
278 Extract uppercase letters from string Code Completion Modify the static return upperCase method in the MyMethods class so that it returns a string of the upper case... CodeCheck Recursion
279 Read XML from string or file. Code Completion You are given a string that is either valid XML (when it starts with a '<' character) or the name... CodeCheck XML
280 Given an input string, print the string with the first and last letter removed if they were equal, or the original string if they were not. Code Completion Given an input string, print the string with the first and last letter removed if they were equal, or the... CodeCheck Branches, Branches Without Functions
281 c_formatirane_datoteke_citanje_broja_i_stringa Neka svaki red u datoteci datoteka.txt sadrži jedan broj i jedan string, razdvojeni razmakom. Napisati program koji će ispisati na... PCEX
282 c_formatirane_datoteke_citanje_brojeva_i_stringa Data je datoteka knjige.txt koja u svakom redu sadrži sljedeće podatke razdvojene zarezom: cijena (realan broj), broj primjeraka (cijeli broj)... PCEX
283 Contando las Ocurrencias de un String en Otro (Caso 1) Construye un programa que tenga una función que reciba un string y devuelva el número de veces que el string... PCEX for loop, loops
284 c_formatirane_datoteke_upis_broja_i_stringa U programu su data imena studenata. Potrebno je kreirati novu datoteku studenti.txt i u nju upisati za svakog studenta njegov... PCEX
285 Creating a function that checks if the string is a palindrome or not. Construct a program which determines whether the original string is a palindrome. The function should be case insensitive i.e. upper... jsParsons search algorithms
286 Creating a function that checks if the string is a palindrome or not. Construct a function which determines whether the string given as a paramter is a palindrome. The function should be case... jsParsons recursion, search algorithms
287 Construct a function which determines whether the string given as a paramter is a palindrome. Construct a function that checks if the string is a palindrome or not. The function should be case insensitive i.e.... jsParsons recursion
288 Turing Machine Exercise: Reverse a String Automata Construction Exercise User creates a Turing machine that, given string W, outputs WW^R. OpenDSA Turing Machine
289 Turing Machine to Copy a String Algorithm Visualization, Code Tracing Presentation Slideshow presenting the execution of a Turing machine that copies a string. OpenDSA Turing Machine
290 Given a two-dimensional array of integers and a string N, E, S, W, give the middle element along the border in the given compass direction, or the average of the two middle ones if the border length is even. Code Completion Given a two-dimensional array of integers and a string N, E, S, W, give the middle element along the border... CodeCheck Two-Dimensional Arrays, No Loops
291 Given a two-dimensional array of integers and a string NW, NW, SW, SE, return the sum of the four elements in the given compass direction. Code Completion Given a two-dimensional array of integers and a string NW, NW, SW, SE, return the sum of the four elements... CodeCheck Two-Dimensional Arrays, No Loops
292 Given a two-dimensional array of integers and a string N, E, S, W, return the sum of all elements of the border in the given compass direction. Code Completion Given a two-dimensional array of integers and a string N, E, S, W, return the sum of all elements of... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
293 Given a two-dimensional array of integers and a string N, E, S, W, return the sum of all elements of the border in the given compass direction. Code Completion Given a two-dimensional array of integers and a string N, E, S, W, return the sum of all elements of... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
294 Given a two-dimensional array of integers and a string N, E, S, W, give the middle element along the border in the given compass direction, or the average of the two middle ones if the border length is even. Code Completion Given a two-dimensional array of integers and a string N, E, S, W, give the middle element along the border... CodeCheck Two-Dimensional Arrays, No Loops
295 Given a two-dimensional array of integers and a string NW, NW, SW, SE, return the sum of the four elements in the given compass direction. Code Completion Given a two-dimensional array of integers and a string NW, NW, SW, SE, return the sum of the four elements... CodeCheck Two-Dimensional Arrays, No Loops
296 Static method for counting the number of times a character appears in a string Code Completion Supply a static method that counts the number of times that a specific character appears in a given string. For... CodeCheck Designing Classes
297 Given a two-dimensional array of integers, row/column indexes r, c, and a string N E S W, return the neighbor in that direction, or 0 if it doesn't exist. Code Completion Given a two-dimensional array of integers, row/column indexes r, c, and a string N E S W, return the neighbor... CodeCheck Two-Dimensional Arrays, No Loops
298 Given a two-dimensional array of integers and row/column positions r, c, return the compass direction of the largest neighbor as a string N E S W NE NW SE SW. Code Completion Given a two-dimensional array of integers and row/column positions r, c, return the compass direction of the largest neighbor as... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
299 Given a two-dimensional array of integers, an index, and a string R or C, return the sum of the elements in that row or column. Code Completion Given a two-dimensional array of integers, an index, and a string R or C, return the sum of the elements... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
300 Given a two-dimensional array of integers and row/column positions r, c, return the compass direction of the largest neighbor as a string N E S W NE NW SE SW. Code Completion Given a two-dimensional array of integers and row/column positions r, c, return the compass direction of the largest neighbor as... CodeCheck Two-Dimensional Arrays, Looping over Neighbors
301 Given a two-dimensional array of integers, an index, and a string R or C, return the sum of the elements in that row or column. Code Completion Given a two-dimensional array of integers, an index, and a string R or C, return the sum of the elements... CodeCheck Two-Dimensional Arrays, Loops Along a Row or Column
302 Given a two-dimensional array of integers, row/column indexes r, c, and a string N E S W, return the neighbor in that direction, or 0 if it doesn't exist. Code Completion Given a two-dimensional array of integers, row/column indexes r, c, and a string N E S W, return the neighbor... CodeCheck Two-Dimensional Arrays, No Loops
303 (Recursion) Recursive is palindrome - CSEdPad This program checks a string is palindrome or not (first half of the string is the same as the second... AnnEx recursion
304 c_izbacivanje_svakog_ntog_karaktera Napisati program u kojem se iz datog stringa izbacuje svaki n-ti karakter. Brojanje karaktera počinje od 1 (prvi karakter se... PCEX
305 c_izbacivanje_nte_rijeci Napisati program koji iz datog stringa izbacuje n-tu riječ po redu. Brojanje počinje od 1 (prva riječ se treba obrisati... PCEX
306 c_brisanje_samoglasnika Napisati program koji iz datog stringa briše sve samoglasnike. PCEX
307 Determining Whether One is a Teenager (Case 1) Construct a program that receives a string that has the user name and age separated by a colon, and prints... PCEX exception handling, exceptions
308 c_zamjena_svakog_drugog_znaka Napisati program u kojem se u unešenom stringu zamijeni svaki drugi znak znakom '*'. Kandidati za zamjenu su znakovi koji... PCEX
309 Determinando Si Uno Es Adolescente (Caso 1) Construir un programa que reciba un string que tiene el nombre de usuario y la edad separados por dos puntos,... PCEX exceptions
310 c_funkcija_prebroji_znak Implementirati funkciju prebroji koja prima string i karakter, te vraća broj pojavljivanja tog karaktera u stringu. U glavnom programu omogućiti... PCEX
311 c_funkcija_nadji_rijec Napisati funkciju nadji_rijec koja prima dva stringa s1 i s2, pri čemu s1 predstavlja neku rečenicu, a s2 jednu riječ.... PCEX
312 c_ubacivanje_rijeci Napisati program koji u datom stringu zamjenjuje svaku cifru 1 sa tekstom "jedan". Pretpostaviti da je primljeni string dovoljno velik... PCEX
313 c_funkcija_podstring Napisati funkciju podstring koja prima dva stringa s1 i s2, te provjerava da li je s2 podstring stringa s1. Ako... PCEX
314 c_funkcija_ukloni_razmake Napisati funkciju ukloni_razmake koja prima string i uklanja sve razmake u njemu. Funcija treba vratiti pokazivač na početak izmijenjenog stringa. PCEX
315 Huffman Coding Tree Slideshow: Decoding Algorithm Visualization Slideshow visualizing the process of decoding a string of Huffman Codes. OpenDSA Huffman Coding Tree
316 Determining Whether One is a Teenager Construct a program that receives a string that has the user name and age separated by a colon, and prints... PCEX exception handling, exceptions
317 Determining Whether One is a Teenager Construct a program that receives a string that has the user name and age separated by a colon, and prints... PCEX exception handling, exceptions, if-else statement
318 Creating an Array of User Inputs Construct a program that creates an array of eight string values received from the user. PCEX arrays
319 c_brojanje_rijeci_alfanumericki Napisati program u kojem se omogućava unos nekog stringa, a zatim se ispisuje broj riječi koje se u njemu nalaze.... PCEX
320 c_brojanje_rijeci_razmaci Napisati program u kojem se omogućava unos nekog stringa s najviše 1000 karaktera, a zatim se ispisuje broj riječi koje... PCEX
321 c_brojanje_rijeci_s_velikim_pocetnim_slovom Napisati program u kojem se omogućava unos nekog stringa, a zatim se ispisuje broj njegovih riječi koje počinju velikim slovom.... PCEX
322 Determining Whether One is a Teenager (Case 2) Construct a program that asks the user to enter a string that has the user name and age separated by... PCEX exceptions
323 Creando un Diccionario de Pares Caracteres-Frecuencia Construye un programa que tenga una función que reciba un string del usuario y cree un diccionario que mapea cada... PCEX dictionaries
324 Creando un Diccionario de Pares Caracteres-Palabras Construye un programa que tenga una función que reciba un string y cree un diccionario que mapea cada carácter a... PCEX dictionaries
325 Determinando Si Uno Es Adolescente (Caso 2) Construye un programa que le pida al usuario que ingrese un string que contenga el nombre de usuario y la... PCEX exceptions
326 Letter frequency Construct a program which counts the frequency of each character in string 'Summer' and stores it in a dictionary. Finally,... jsParsons dictionaries
327 Turing Machine Exercise: Add an a Automata Construction Exercise User creates a Turing machine that adds an a to a string of a's. OpenDSA Turing Machine
328 Turing Machine Exercise: Erase abc Automata Construction Exercise User creates a Turing machine that erases a string of a's, b's, and c's. OpenDSA Turing Machine
329 Turing Machine Exercise: Keep abc Automata Construction Exercise User creates a Turing machine that moves over a string of a's, b's, and c's. OpenDSA Turing Machine
330 CFG Ambiguity 1 Exercise Question A question where users determine whether a given string is parsed ambiguously or not. OpenDSA Context-Free Grammar, Parse Tree
331 CFG Ambiguity 2 Exercise Question A question where users determine whether a given string is parsed ambiguously or not. OpenDSA Context-Free Grammar, Ambiguity
332 CFG Ambiguity 3 Exercise Question A question where users determine whether a given string is parsed ambiguously or not. OpenDSA Context-Free Grammar, Ambiguity
333 Context-Free Language Membership Problem Frameset Programmed Instruction Programmed Instruction Frameset discussing how to recognize if a given string is derivable from a given Context-Free Grammar. OpenDSA Context-Free Language
334 DFA Example Trace: How a DFA Traces Algorithm Visualization, Code Tracing Presentation Visualization of how a DFA would process an input string. OpenDSA Deterministic Finite Automata
335 Creating a Dictionary of Character-Count/Words Pairs Construct a program that has a function which receives a string from the user and creates a dictionary that maps... PCEX classes, data structures, dictionaries, dictionary, stacks
336 Creating an Array of User Inputs Construct a program that creates an array of eight string values received from the user. PCEX arrays
337 Determining Whether One is a Teenager (Case 2) Construct a program that asks the user to enter a string that has the user name and age separated by... PCEX classes, exception handling, exceptions, file i/o, if-else statement, loops, methods, objects
338 Creating a Dictionary of Character-Count/Words Pairs Construct a program that has a function which receives a string and creates a dictionary that maps each character to... PCEX dictionaries, dictionary
339 Determining Whether One is a Teenager Construct a program that asks the user to enter a string that has the user name and age separated by... PCEX exception handling, if-else statement
340 Updating an Element in a List (Case 3) Construct a program that initializes a list with four string values, changes the last element in the list, and finally,... PCEX list, value vs reference
341 Adding Values to an Empty List Construct a program that creates a list of eight string values received from the user. PCEX list
342 ClassSchedule Code Completion Implement a class ClassSchedule with a title (a string), days the class meets (a string), a start meeting time (a... CodeCheck Classes
343 Last n Characters Code Completion Write a method that gets the last n characters from a string. For example, last("Hello, World!", 5) should return the... CodeCheck Fundamental Data Types
344 Swap first and last name Code Completion Write a method getLastFirst whose parameter is a string containing a name such as "Harry Smith" and that returns a... CodeCheck Fundamental Data Types
345 (Inheritance) Physics teacher - CSEdPad Demonstrate the inheritance concept by creating a superclass Teacher with a private string features designation and collegeName and does function.... AnnEx inheritance
346 Letter frequency Construct a function which counts the frequency of each character in the string given as a parameter and returns a... jsParsons dictionaries
347 Determining Number of Parse Tree Nodes Exercise: Alternate Calculation Exercise, Battery User determines the number of nodes in a parse tree generated by a given string on a given grammar. Alternative... OpenDSA Context-Free Grammar, Parse Tree
348 CFG Ambiguity 1 Exercise: Alternate Question, Battery A collection of self-practice questions where users determine whether a given string is parsed ambiguously or not. Alternate version. OpenDSA Context-Free Grammar, Ambiguity
349 CFG Ambiguity 2 Exercise: Alternate Question, Battery A second collection of self-practice questions where users determine whether a given string is parsed ambiguously or not. Alternate version. OpenDSA Context-Free Grammar, Ambiguity
350 CFG Ambiguity 3 Exercise: Alternate Question, Battery A third collection of self-practice questions where users determine whether a given string is parsed ambiguously or not. Alternate version. OpenDSA Context-Free Grammar, Ambiguity
351 Determining Number of Parse Tree Nodes Exercise Calculation Exercise User determines the number of nodes in a parse tree generated by a given string on a given grammar. OpenDSA Context-Free Grammar, Parse Tree
352 Pumping Lemma Example: wwR Programmed Instruction, Proof Visualization Programmed Instruction slideshow showing the pumping lemma proof that the language consisting of a string w followed by the reverse... OpenDSA Non-Regular Language
353 Stutter Code Completion Your task is to write a method stutter that repeats all letters t in a string. For example, the call... CodeCheck Loops
354 GetVowels Code Completion Your task is to write a method getVowels that gets the vowels in a string. For example, the call getVowels("Hello,... CodeCheck Loops
355 Letter frequency (count) Code Completion Write a method that computes how often each letter A-Z or a-z occurs in a string. Don't distinguish between upper-... CodeCheck Arrays and Array Lists
356 c_upis_reda_na_kraj_datoteke Data je datoteka knjige.txt koja u svakom redu sadrži sljedeće podatke razdvojene zarezom: cijena (realan broj), broj primjeraka (cijeli broj)... PCEX
357 c_pretvaranje_broja_u_slovo Napisati program koji omogućava unos teksta sa maksimalno 1000 karaktera, a zatim u tekstu zamjenjuje sve brojeve sa slovom 'B'.... PCEX
358 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Two-Dimensional Arrays, No Loops
359 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches Without Functions
360 On a chessboard, fields are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, fields are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches Without Functions
361 Huffman Coding Proficiency Exercise Tracing Exercise Practice profiency exercise for Huffman Coding Trees. User must do actions like show the codes for a string, or vice... OpenDSA Huffman Coding Tree
362 Turing Machines Deciding vs. Accepting Frameset Programmed Instruction Slideshow presenting the distinction between a Turing Machine that decides a language (always halts with a decision) vs. one that... OpenDSA Turing Machine
363 JLinkedListUtil This LinkedListUtil class tests various usages of the LinkedList class. The single param is an array of string. You will... PCEX
364 JLinkedListUtil Challenge This LinkedListUtil class tests various usages of the LinkedList class. The single param is an array of string. You will... PCEX
365 Letter frequency (percentage) Code Completion Write a method that computes the frequency (as a percentage between 0.0 and 1.0) of each letter A-Z or a-z... CodeCheck Arrays and Array Lists
366 Recursive toString for array Code Completion Complete the static mkString method in the MyMethods class so that it formats an array of int values, with the... CodeCheck Recursion
367 Balloon Filled Sky Code Completion Your task is to draw n balloons centered at random positions, each with a randomly colored circle and a white... CodeCheck Loops
368 Initials Code Completion Complete the initials method in the class below. For example, the call initials("Harry", "Joseph", "Hacker") should return the string "HJH". CodeCheck Fundamental Data Types
369 Using an Abstract Class Code Completion Light bulbs can be identified by type and can be measured by the amount of lumens produced per watt of... CodeCheck Inheritance
370 Check for Valid Answers Code Completion Consider a program that administers multiple-choice quizzes. The student needs to provide a response such as A or D. Your... CodeCheck Branches
371 On a chessboard, fields are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, fields are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches Without Functions
372 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Branches, Branches Without Functions
373 On a chessboard, positions are marked with a letter between a and h for the column and a number between 1 and 8 for the row. Code Completion On a chessboard, positions are marked with a letter between a and h for the column and a number between... CodeCheck Two-Dimensional Arrays, No Loops
374 Animal Class Hierarchy (Case 2) Suppose we have a class Animal and we want to extend it to produce class Dog. An animal has a... PCEX inheritance
375 Animal Class Hierarchy (Case 2) Suppose we have a class Animal and we want to extend it to produce class Dog. An animal has a... PCEX inheritance
376 371t3 hack3rs Code Completion The "elite hackers" like to make their text look cool by replacing characters with similar-looking symbols: e becomes 3, i... CodeCheck Objects
377 XML Map Labels Code Completion The latitude, longitude and place name are used to label a map. Implement a class with latitude and longitude as... CodeCheck Classes
378 Color codes for double-sized image Code Completion Consider an image that is composed of a number of colored small squares, each colored in one of these 8... CodeCheck Loops
379 Middle Letter Code Completion Complete the getMiddle method that gets the middle character from a word if the word length is odd, or the... CodeCheck Branches
380 XML Map Labels convert to decimal degrees Code Completion The latitude, longitude and place name are used to label a map. Implement a class with latitude and longitude as... CodeCheck Classes