C++ String: Exercises, Practice, Solution

C++ String [21 exercises with solution]

[An editor is available at the bottom of the page to write and execute the scripts.]

1. Write a C++ program to reverse a given string. Go to the editor
Example:
Sample Input: w3resource
Sample Output: ecruoser3w
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2. Write a C++ program to change every letter in a given string with the letter following it in the alphabet (ie. a becomes b, p becomes q, z becomes a). Go to the editor
Example:
Sample Input: w3resource
Sample Output: x3sftpvsdf
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3. Write a C++ program to capitalize the first letter of each word of a given string. Words must be separated by only one space. Go to the editor
Example:
Sample Input: cpp string exercises
Sample Output: Cpp String Exercises
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4. Write a C++ program to find the largest word in a given string. Go to the editor
Example:
Sample Input: C++ is a general-purpose programming language.
Sample Output: programming
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5. Write a C++ program to sort characters (numbers and punctuation symbols are not included) in a string. Go to the editor
Example:
Sample Input: python
Sample Output: hnopty
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6. Write a C++ program to check whether the characters e and g are separated by exactly 2 places anywhere in a given string at least once. Go to the editor
+ Example:
Sample Input: eagerer
Sample Output: eagerer -> 1
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7. Write a C++ program to count all the vowels in a given string. Go to the editor
Example:
Sample Input: eagerer
Sample output: number of vowels -> 4
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8. Write a C++ program to count all the words in a given string. Go to the editor
Example:
Sample Input: Python
Sample Output: number of words -> 1
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9. Write a C++ program to check whether two characters present equally in a given string. Go to the editor
Example:
Sample Input: aabcdeef
Sample Output: True
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10. Write a C++ program to check if a given string is a Palindrome or not. Go to the editor
A palindrome is a word, number, phrase, or other sequence of characters which reads the same backward as forward, such as madam, racecar.
Example:
Sample Input: madam
Sample Output: True
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11. Write a C++ program to find a word in a given string which has the highest number of repeated letters. Go to the editor
Example:
Sample Input: Print a welcome text in a separate line.
Sample Output: Word which has the highest number of repeated letters. separate
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12. Write a C++ program to insert a dash character (-) between two odd numbers in a given string of numbers. Go to the editor
Example:
Sample Input: 1345789
Sample Output: Result-> 1-345-789
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13. Write a C++ program to change the case (lower to upper and upper to lower cases) of each character of a given string. Go to the editor
Example:
Sample Input: Pythpn
Sample Output: pYTHON
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14. Write a C++ program to find the numbers in a given string and calculate the sum of all numbers. Go to the editor
Example:
Sample Input: w3resource from 2008
Sample Output: Sum of the numbers: 2011
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15. Write a C++ program to convert a given non-negative integer to English words. Go to the editor
Example:
Sample Input: 12
Sample Output: Twelve
Sample Input: 29
Sample Output: Twenty Nine
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16. Write a C++ program to find the longest common prefix from a given array of strings. Go to the editor
Example:
The longest common prefix is: Pa
The longest common prefix is: J
The longest common prefix is:
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17. Write a C++ program to find all combinations of well-formed brackets from a given pairs of parentheses. Go to the editor
Example:
n = 2
[[]] [][]
n = 3
[[]] [][] [[[]]] [[][]] [[]][] [][[]] [][][]
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18. Write a C++ programming to find the length of the longest valid (correct-formed) parentheses substring of a given string. Go to the editor
Example:
Original Parentheses string: [[]
Length of longest parentheses: 2
Original Parentheses string: [[]]]
Length of longest parentheses: 4
Original Parentheses string: ]]]][[[[
Length of longest parentheses: 0
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19. A vowel is a syllabic speech sound pronounced without any stricture in the vocal tract. Vowels are one of the two principal classes of speech sounds, the other being the consonant. Go to the editor
Example:
Original string: w3resource
After reversing the vowels of the said string: w3resuorce
Original string: Python
After reversing the vowels of the said string: Python
Original string: Hello
After reversing the vowels of the said string: Holle
Original string: USA
After reversing the vowels of the said string: ASU
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20. Write a C++ program to find the length of the longest palindrome in a given string (uppercase or lowercase letters). Go to the editor
Example:
Original string: w3resource
After reversing the vowels of the said string: w3resuorce
Original string: Python
After reversing the vowels of the said string: Python
Original string: Hello
After reversing the vowels of the said string: Holle
Original string: USA
After reversing the vowels of the said string: ASU
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21. Write a C++ program to check whether a given string is a subsequence of another given string. Return 1 for true and 0 for false. Go to the editor
Example:
word1: apple
subse1: apl
Is subse1 is the subsequence of word1? 1
word2: apple
subse2: ppe
Is subse2 is the subsequence of word2? 1
word3: ACGGTGTCGTGCTATGCTGATGCTGACTTATATGCTA
subse3: CGTTCGGCTATGCTTCTACTTATTCTA
Is subse3 is the subsequence of word3? 1
word4: CGTTCGGCTATCGTACGTTCTATTCTATGATTTCTAA
subse4: CGTTCGGCTATGCZTTCTACTTATTCTA
Is subse4 is the subsequence of word4? 0
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