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# Exercise Title Features Description Platform Keywords
1 (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
2 (Strings) String length - CSEdPad Given a string, this program finds out the length of a string. AnnEx string
3 Strings Review Quiz Question, Battery Strings introduction for CS1 review questions. OpenDSA String
4 simple format Python PredictingFinalResult for demonstrating simple format QuizPET string formatting, strings
5 format with one argument Python PredictingFinalResult for demonstrating format with one argument QuizPET string formatting, strings
6 format with two arguments Python PredictingFinalResult for demonstrating format with two arguments QuizPET string formatting, strings
7 format with three arguments Python PredictingFinalResult for demonstrating format with three arguments QuizPET string formatting, strings
8 String Formatting V1 Python PredictingFinalResult for demonstrating String Formatting V1 QuizPET strings
9 String Formatting Python PredictingFinalResult for demonstrating String Formatting QuizPET strings
10 String Formatting 1 Python PredictingFinalResult for demonstrating String Formatting 1 QuizPET strings
11 String Formatting 2 Python PredictingFinalResult for demonstrating String Formatting 2 QuizPET strings
12 Output Formatting Python BehaviorExample for demonstrating Output Formatting WebEx string formatting, strings
13 Output Formatting 2 Python BehaviorExample for demonstrating Output Formatting 2 WebEx string formatting, strings
14 String Index Search Python BehaviorExample for demonstrating String Index Search WebEx search algorithms, strings
15 String Variables Java PredictingFinalResult for demonstrating String Variables QuizJET data types, primitive data types, string operations, strings, variables
16 Strings 1 Java PredictingFinalResult for demonstrating Strings 1 QuizJET string, string operations, strings
17 Strings 2 Java PredictingFinalResult for demonstrating Strings 2 QuizJET string operations, strings
18 Strings 3 Java PredictingFinalResult for demonstrating Strings 3 QuizJET string operations, strings
19 Strings 4 Java PredictingFinalResult for demonstrating Strings 4 QuizJET string operations, strings
20 Strings 5 Java PredictingFinalResult for demonstrating Strings 5 QuizJET string operations, strings
21 String Concat Java PredictingFinalResult for demonstrating String Concat QuizJET strings
22 String (equals) Java PredictingFinalResult for demonstrating String (equals) QuizJET string operations, strings
23 String (replace) Java PredictingFinalResult for demonstrating String (replace) QuizJET string operations, strings
24 String Length String Length AnnEx strings
25 String Equals Java BehaviorExample for demonstrating String Equals AnnEx boolean expressions, strings, variables
26 String Example StringExample AnnEx strings
27 String Indexing Construct a program that first prints out strings "Py", "th", "o", and "n" jsParsons strings
28 String join Construct a program that prints out a sentence from a given list of words. jsParsons strings
29 Concat Demo Java CodeVisualization for demonstrating Concat Demo JSVEE string operations, strings
30 String Example Java CodeVisualization for demonstrating String Example JSVEE string operations, strings
31 ToString Demo Java CodeVisualization for demonstrating ToString Demo JSVEE string operations, strings
32 Format 1 Python CodeVisualization for demonstrating Format 1 JSVEE string formatting, strings
33 Format 2 Python CodeVisualization for demonstrating Format 2 JSVEE string formatting, strings
34 f-string formatting 1 Python PredictingFinalResult for demonstrating f-string formatting 1 QuizPET strings
35 f-string formatting 2 Python PredictingFinalResult for demonstrating f-string formatting 2 QuizPET strings
36 f-string formatting 3 Python PredictingFinalResult for demonstrating f-string formatting 3 QuizPET strings
37 f-string formatting 4 Python PredictingFinalResult for demonstrating f-string formatting 4 QuizPET strings
38 Finding character in a string Python BehaviorExample for demonstrating Finding character in a string WebEx strings
39 Strings 6 Java PredictingFinalResult for demonstrating Strings 6 QuizJET conditionals, data types, string operations, strings, variables
40 Char Strings (Memphis) Some demos of working with the char and String data types. AnnEx strings
41 Creating String Creating String AnnEx strings
42 f-string format 1 Python CodeVisualization for demonstrating f-string format 1 JSVEE strings
43 f-string format 2 Python CodeVisualization for demonstrating f-string format 2 JSVEE strings
44 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
45 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
46 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
47 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
48 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
49 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
50 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
51 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
52 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
53 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
54 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
55 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
56 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
57 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
58 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
59 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
60 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
61 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
62 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
63 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
64 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
65 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
66 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
67 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
68 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
69 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
70 q_py_aliasing3_es Python PredictingFinalResult for demonstrating q_py_aliasing3_es QuizPET strings
71 q_py_concat_strings1_es Python PredictingFinalResult for demonstrating q_py_concat_strings1_es QuizPET strings
72 concatenate strings Python PredictingFinalResult for demonstrating concatenate strings QuizPET strings
73 q_py_output2_es Python PredictingFinalResult for demonstrating q_py_output2_es QuizPET strings
74 q_py_str_ref1_es Python PredictingFinalResult for demonstrating q_py_str_ref1_es QuizPET strings
75 q_py_substring1_es Python PredictingFinalResult for demonstrating q_py_substring1_es QuizPET strings
76 substring Python PredictingFinalResult for demonstrating substring QuizPET strings
77 Different Ways to Print Python BehaviorExample for demonstrating Different Ways to Print WebEx strings, variables
78 Strings Basics Python BehaviorExample for demonstrating Strings Basics WebEx strings
79 Sub-Strings Python BehaviorExample for demonstrating Sub-Strings WebEx strings
80 Adding Strings Python BehaviorExample for demonstrating Adding Strings WebEx strings
81 Escape Characters Python BehaviorExample for demonstrating Escape Characters WebEx strings
82 2-21_StringDemos Java BehaviorExample for demonstrating 2-21_StringDemos AnnEx strings
83 Strings (charAt) Java BehaviorExample for demonstrating Strings (charAt) AnnEx strings
84 Strings (equalsIgnoreCase) Java BehaviorExample for demonstrating Strings (equalsIgnoreCase) AnnEx strings
85 Strings (parse) Java BehaviorExample for demonstrating Strings (parse) AnnEx strings
86 Strings (replace) Java BehaviorExample for demonstrating Strings (replace) AnnEx strings
87 Substring Substring AnnEx strings
88 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
89 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
90 Practicar el corte de cadenas (slicing) Construye un programa que primero imprima las cadenas "Py", "th", "o" y "n" jsParsons strings
91 Strings Python CodeVisualization for demonstrating Strings JSVEE strings
92 Palindrome Python CodeVisualization for demonstrating Palindrome JSVEE strings
93 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
94 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
95 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
96 Comparing Strings Java PredictingFinalResult for demonstrating Comparing Strings QuizJET boolean expressions, control flow, string operations
97 Comparing Strings Java PredictingFinalResult for demonstrating Comparing Strings QuizJET boolean expressions, conditionals, data types, string operations, strings, variables
98 Converting String to double Java PredictingFinalResult for demonstrating Converting String to double QuizJET primitive data types, strings
99 Converting String to int Java PredictingFinalResult for demonstrating Converting String to int QuizJET primitive data types, strings
100 q_py_output1_es Python PredictingFinalResult for demonstrating q_py_output1_es QuizPET operators, strings, variables
101 q_py_output3_es Python PredictingFinalResult for demonstrating q_py_output3_es QuizPET operators, strings, variables
102 Practicar métodos de cadenas Construye un programa que imprima una oracion a partir de una lista dada de palabras. jsParsons list, strings
103 Objects 4 (String) Java PredictingFinalResult for demonstrating Objects 4 (String) QuizJET classes, object, objects, strings
104 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
105 if-else 1 Java PredictingFinalResult for demonstrating if-else 1 QuizJET boolean expressions, conditionals, if-else statement, strings
106 string reference Python PredictingFinalResult for demonstrating string reference QuizPET aliasing, value vs reference
107 String Concatenation (Case 1) Construct a program that prints the text "24 and 45 concatenated: 2445" and "24 and 45 added: 69". PCEX
108 String Concatenation (Case 2) Construct a program that prints the text "333", "63", and "36". PCEX
109 String Concatenation (Case 1) Construct a program that prints the text "24 and 45 concatenated: 2445" and "24 and 45 added: 69". PCEX
110 String Concatenation (Case 2) Construct a program that prints the text "333", "63", and "36". PCEX
111 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
112 String Comparison (Case 2) Construct the program that modifies the string "hexxo worxd!" so that it matches (ignoring case) the string "HELLO WORLD!". PCEX
113 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
114 String Comparison (Case 2) Construct the program that modifies the string "hexxo worxd!" so that it matches (ignoring case) the string "HELLO WORLD!". PCEX
115 String With Escape Characters (Case 1) Construct a program that prints the following output:\n"Quotes"\nSlashes\n\//\nHow '"confounding' "\" it is! PCEX
116 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
117 String With Escape Characters (Case 3) Construct a program that prints the following output:\n"Slashes"\\//\n \\//\nHow '"confounding' "\" it is! PCEX
118 String With Escape Characters (Case 1) Construct a program that prints the following output:\n"Quotes"\nSlashes\n\//\nHow '"confounding' "\" it is! PCEX
119 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
120 String With Escape Characters (Case 3) Construct a program that prints the following output:\n"Slashes"\\//\n \\//\nHow '"confounding' "\" it is! PCEX
121 string_compare C++ BehaviorExample for demonstrating string_compare AnnEx
122 string_lib_func1 C++ BehaviorExample for demonstrating string_lib_func1 AnnEx
123 string_to_integer C++ BehaviorExample for demonstrating string_to_integer AnnEx
124 String Comparison String Comparison AnnEx if-else statement
125 String Operation String Operation AnnEx pattern matching
126 String Operation pt This is the portuguese version. AnnEx pattern matching
127 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
128 strings.addition PCEX Set of activities for strings.addition PCEX
129 strings.addition PCEX Set of activities for strings.addition PCEX
130 strings.charAt PCEX Set of activities for strings.charAt PCEX
131 strings.charAt PCEX Set of activities for strings.charAt PCEX
132 strings.equals PCEX Set of activities for strings.equals PCEX
133 strings.equals PCEX Set of activities for strings.equals PCEX
134 strings.escape_chars PCEX Set of activities for strings.escape_chars PCEX
135 strings.escape_chars PCEX Set of activities for strings.escape_chars PCEX
136 strings.substring PCEX Set of activities for strings.substring PCEX
137 strings.substring PCEX Set of activities for strings.substring PCEX
138 Strings (Concatenation) Java BehaviorExample for demonstrating Strings (Concatenation) AnnEx
139 Accessing String Characters (Case 1) Construct a program that prints the 1st, 9th, and the last character of the string "String Example!". PCEX
140 Accessing String Characters (Case 2) Construct a program that prints the 7th, 11th, and 14th character of the string "Second Example!". PCEX
141 Accessing String Characters (Case 1) Construct a program that prints the 1st, 9th, and the last character of the string "String Example!". PCEX
142 Accessing String Characters (Case 2) Construct a program that prints the 7th, 11th, and 14th character of the string "Second Example!". PCEX
143 find_string C++ BehaviorExample for demonstrating find_string AnnEx
144 DEPRECATED_String Comparison Java BehaviorExample for demonstrating DEPRECATED_String Comparison AnnEx
145 DEPRECATED_String Length Java BehaviorExample for demonstrating DEPRECATED_String Length AnnEx
146 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
147 Concatenating Strings and Numbers (Case 1) Construct a program that uses variables x, y, and z to print "Python was invented in 1989.". PCEX
148 Concatenating Strings and Numbers (Case 2) Construct a program that uses variables x, y, and z to print "x * 2 = 4". PCEX
149 Concatenating Strings and Numbers (Case 3) Construct a program that uses variables x, y, and z to print "10 + 20 = 30". PCEX
150 Slanje stringova u funkcije PCEX Set of activities for Slanje stringova u funkcije PCEX
151 DEPRECATED_StringExample Java BehaviorExample for demonstrating DEPRECATED_StringExample AnnEx
152 list reference (string) Python PredictingFinalResult for demonstrating list reference (string) QuizPET aliasing, value vs reference
153 q_py_q_py_string_formatting1_es Python PredictingFinalResult for demonstrating q_py_q_py_string_formatting1_es QuizPET
154 q_py_q_py_string_formatting2_es Python PredictingFinalResult for demonstrating q_py_q_py_string_formatting2_es QuizPET
155 Objects 5 (String) Java PredictingFinalResult for demonstrating Objects 5 (String) QuizJET classes, objects
156 Concatenating Characters of Two Strings (Case 1) Construct a program that has a function that receives two strings and returns a string formed from the given strings... PCEX
157 Concatenating Characters of Two Strings (Case 2) Construct a program that has a function that receives two strings and returns a string formed from the given strings... PCEX
158 Concatenating Characters of Two Strings (Case 1) Construct a program that has a function that receives two strings and returns a string formed from the given strings... PCEX
159 Concatenating Characters of Two Strings (Case 2). Construct a program that has a function that receives two strings and returns a string formed from the given strings... PCEX
160 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
161 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
162 Repeating Characters of a String (Case 1) Construct a program that has a function that receives a string and creates a new string that has each character... PCEX
163 Repeating Characters of a String (Case 2) Construct a program that has a function that receives a string and creates a new string that has every other... PCEX
164 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
165 Ubacivanje karaktera u string PCEX Set of activities for Ubacivanje karaktera u string PCEX
166 DEPRECATED_Creating String Java BehaviorExample for demonstrating DEPRECATED_Creating String AnnEx
167 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
168 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
169 PDA Exercise: String and Reverse Automata Construction Exercise User creates a Pushdowns Automata that accepts the langugage WcW^R. OpenDSA Pushdown Automata
170 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
171 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
172 Variable type: Strings Python BehaviorExample for demonstrating Variable type: Strings WebEx operators, variables
173 Brisanje dijelova stringa PCEX Set of activities for Brisanje dijelova stringa PCEX
174 csedpad.04.StringClass.no_topic PCEX Set of activities for csedpad.04.StringClass.no_topic PCEX
175 csedpad.04.StringClass.no_topic_1 PCEX Set of activities for csedpad.04.StringClass.no_topic_1 PCEX
176 csedpad.04.StringClass.no_topic_1 Given a person name, the program finds out the length, i.e., the number of characters, of the name. PCEX
177 csedpad.04.StringClass.no_topic_1 Given two names of two places, the program checks if they are equal in length. PCEX
178 csedpad.04.StringClass.strings PCEX Set of activities for csedpad.04.StringClass.strings PCEX
179 csedpad.04.StringClass.strings Given a person name, this program converts the name into uppercase and lowercase. PCEX
180 csedpad.04.StringClass.strings_1 PCEX Set of activities for csedpad.04.StringClass.strings_1 PCEX
181 csedpad.04.StringClass.strings_1 Given a first name and last name of a person, the program concatenates them to form a full name. PCEX
182 Detektovanje granica unutar stringa PCEX Set of activities for Detektovanje granica unutar stringa PCEX
183 Mijenjanje karaktera u stringu PCEX Set of activities for Mijenjanje karaktera u stringu PCEX
184 c_trazenje_karaktera_u_stringu Napisati program koji provjerava da li se u datom stringu nalazi određeni karakter. PCEX
185 c_trazenje_karaktera_u_stringu_pokazivaci Napisati program koji pomoću pokazivačke aritmetike provjerava da li se u datom stringu nalazi određeni karakter. PCEX
186 c_spajanje_dva_stringa Napisati program koji dodaje sadržaj drugog stringa prvom stringu. PCEX
187 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
188 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
189 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
190 Regular Expression Exercise: Strings Containing aba RegEx Writing Exercise User writes an regular expression for the language of strings containing aba. OpenDSA Regular Expression
191 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
192 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
193 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
194 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
195 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
196 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
197 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
198 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
199 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
200 Counting the Occurrences of One String in Another (Case 1) Construct a program that has a function that receives a string and returns the number of times that the string... PCEX
201 Counting the Occurrences of One String in Another (Case 2) Construct a program that has a function that receives a string and returns the number of times that the string... PCEX
202 Counting the Occurrences of One String in Another (Case 1) Construct a program that has a function that receives a string and returns the number of times that the string... PCEX
203 Counting the Occurrences of One String in Another (Case 2). Construct a program that has a function that receives a string and returns the number of times that the string... PCEX
204 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
205 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
206 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
207 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
208 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
209 Turing Machine Exercise: Reverse a String Automata Construction Exercise User creates a Turing machine that, given string W, outputs WW^R. OpenDSA Turing Machine
210 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
211 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
212 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
213 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
214 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
215 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
216 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
217 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
218 Simple Printing Printing strings and numbers AnnEx variables
219 csedpad.19.ExceptionHandling.exceptionhandling_1 You have an empty string. You are trying to find out whether you can find PCEX
220 (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
221 Characterizing Languages Exercise 2: Alternate Question Users characterize the strings in the language for a given grammar on palindromes. OpenDSA Language, Grammar
222 csedpad.20.Recursion.recursion This program checks whether a string is palindrome or not (meaning the second half of the string is the reverse... PCEX
223 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
224 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
225 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
226 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
227 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
228 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
229 c_ubacivanje_rijeci Napisati program koji u datom stringu zamjenjuje svaku cifru 1 sa tekstom "jedan". Pretpostaviti da je primljeni string dovoljno velik... PCEX
230 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
231 Huffman Coding Tree Slideshow: Decoding Algorithm Visualization Slideshow visualizing the process of decoding a string of Huffman Codes. OpenDSA Huffman Coding Tree
232 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
233 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
234 c_brisanje_samoglasnika Napisati program koji iz datog stringa briše sve samoglasnike. PCEX
235 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
236 c_funkcija_podstring Napisati funkciju podstring koja prima dva stringa s1 i s2, te provjerava da li je s2 podstring stringa s1. Ako... PCEX
237 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
238 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
239 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
240 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
241 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
242 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
243 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
244 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
245 Characterizing Languages Exercise 2 Question Exercise on how to characterize the strings in the language for a given grammar on palindromes. OpenDSA Language, Grammar
246 Context-Free Language Derivations Frameset Programmed Instruction Programmed Instruction Frameset discussing derivations of strings from Context-Free Grammars. OpenDSA Context-Free Language
247 Creating an Array of User Inputs Construct a program that creates an array of eight string values received from the user. PCEX
248 Creating an Array of User Inputs Construct a program that creates an array of eight string values received from the user. PCEX
249 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
250 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
251 Creating a Dictionary of Character-Count Pairs Construct a program that has a function which receives a string from the user and creates a dictionary that maps... PCEX
252 Creating a Dictionary of Character-Words Pairs Construct a program that has a function which receives a string and creates a dictionary that maps each character to... PCEX
253 Creating a Dictionary of Character-Count Pairs Construct a program that has a function which receives a string from the user and creates a dictionary that maps... PCEX
254 Creating a Dictionary of Character-Words Pairs. Construct a program that has a function which receives a string and creates a dictionary that maps each character to... PCEX
255 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
256 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
257 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
258 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
259 Updating an Element in the List (Case 3) Construct a program that initializes a list with four string values, changes the last element in the list, and finally,... PCEX
260 Updating an Element in the List (Case 3). Construct a program that initializes a list with four string values, changes the last element in the list, and finally,... PCEX
261 Add Values to an Empty List (Case 2) Construct a program that creates a list of eight string values received from the user. PCEX
262 Add Values to an Empty List (Case 2). Construct a program that creates a list of eight string values received from the user. PCEX
263 Letter frequency Construct a program which counts the frequency of each character in string 'Summer' and stores it in a dictionary. Finally,... jsParsons dictionaries
264 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
265 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
266 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
267 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
268 CFG Ambiguity 2 Exercise Question A question where users determine whether a given string is parsed ambiguously or not. OpenDSA Context-Free Grammar, Ambiguity
269 CFG Ambiguity 3 Exercise Question A question where users determine whether a given string is parsed ambiguously or not. OpenDSA Context-Free Grammar, Ambiguity
270 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
271 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
272 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
273 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
274 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
275 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
276 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
277 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
278 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
279 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
280 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
281 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
282 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
283 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
284 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
285 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
286 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
287 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
288 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
289 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
290 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
291 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
292 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
293 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
294 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
295 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
296 Jison Grammar Exercise 2 Calculation Exercise A question where users calculate the number of strings parsed successfully by a given grammar. OpenDSA Parser Generator
297 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
298 Number of vowels Write a program that counts how many vowels there are in a string (each one separately). PCEX
299 Plain Old Java Object Class named Book that represents a book with two properties: title (a String) and numberOfPages (an int). PCEX
300 (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
301 Letter frequency Construct a function which counts the frequency of each character in the string given as a parameter and returns a... jsParsons dictionaries
302 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
303 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
304 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
305 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
306 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
307 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
308 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
309 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
310 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
311 Annotating Jison Exercise Tracing Exercise A question where users determine the results of parsing a given collection of strings. OpenDSA Parser Generator
312 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
313 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
314 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
315 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
316 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
317 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
318 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
319 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
320 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
321 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
322 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
323 Array-Based Queue Positions Slideshow Algorithm Visualization Slideshow presenting an initial design for storing a queue in an array. OpenDSA Array-Based Queue
324 List Element Data Slideshow Algorithm Visualization Slideshow discussing the tradeoffs for storing element values in link nodes vs. references to element values. OpenDSA List Element Implementation
325 List Element Type Slideshow Algorithm Visualization Slideshow illustrating the choice between storing non-homogeneous data types in list nodes and limiting to a homogenous data type. OpenDSA List Element Implementation