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