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# Exercise Title Features Description Platform Keywords
1 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
2 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
3 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
4 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
5 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
6 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
7 Concatenating Strings and Numbers Construct a program that uses variables x, y, and z to print "Python was invented in 1989.". PCEX strings
8 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
9 Map words to their lengths Code Completion Given an array of strings, create a tree map with each string as a key and its corresponding value the... CodeCheck Tree Structures
10 Counting the Occurrences of One String in Another Construct a program that has a function that receives a string and returns the number of times that the string... PCEX functions, strings
11 Counting the Occurrences of One String in Another Construct a program that has a function that receives a string and returns the number of times that the string... PCEX for loop, functions, strings
12 Static method for counting the number of times a character appears in a string Code Completion Supply a static method that counts the number of times that a specific character appears in a given string. For... CodeCheck Designing Classes
13 Letter frequency (count) Code Completion Write a method that computes how often each letter A-Z or a-z occurs in a string. Don't distinguish between upper-... CodeCheck Arrays and Array Lists
14 Color codes for double-sized image Code Completion Consider an image that is composed of a number of colored small squares, each colored in one of these 8... CodeCheck Loops
15 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
16 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
17 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
18 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