C String Exercises
Complete these exercises to test your understanding of string arrays.
C String Exercises
Exercise 1
Write a program in C to input a string and print it.
Test Data:
Input the string: Welcome, w3resource
Expected Output:
The string you entered is: Welcome, w3resource
Exercise 2
Write a program in C to find the length of a string without using library function.
Test Data:
Input the string: w3resource.com
Expected Output:
Length of the string is: 15
Exercise 3
Write a program in C to separate the individual characters from a string.
Test Data:
Input the string: w3resource.com
The characters of the string are: w 3 r e s o u r c e . c o m
Exercise 4
Write a program in C to print individual characters of string in reverse order.
Test Data:
Input the string: w3resource.com
Expected Output:
The characters of the string in reverse are: m o c . e c r u o s e r 3 w
Exercise 5
Write a program in C to count the total number of words in a string.
Test Data:
Input the string: This is w3resource.com
Expected Output:
Total number of words in the string is: 3
Exercise 6
Write a program in C to compare two strings without using string library functions.
Test Data:
Check the length of two strings:
--------------------------------
Input the 1st string: aabbcc
Input the 2nd string: abcdef
String1: aabbcc
String2: abcdef
Expected Output:
Strings are not equal.
Check the length of two strings:
--------------------------------
Input the 1st string: aabbcc
Input the 2nd string: aabbcc
String1: aabbcc
String2: aabbcc
Expected Output:
Strings are equal.
Exercise 7
Write a program in C to count total number of alphabets, digits and special characters in a string.
Test Data:
Input the string: Welcome to w3resource.com
Expected Output:
Number of Alphabets in the string is: 21 Number of Digits in the string is: 1 Number of Special characters in the string is: 4
Exercise 8
Write a program in C to copy one string to another string.
Test Data:
Input the string: This is a string to be copied.
Expected Output:
The First string is: This is a string to be copied. The Second string is: This is a string to be copied. Number of characters copied: 31
Exercise 9
Write a program in C to count total number of vowel or consonant in a string.
Test Data:
Input the string: Welcome to w3resource.com
Expected Output:
The total number of vowel in the string is: 9 The total number of consonant in the string is: 12
Exercise 10
Write a program in C to find maximum occurring character in a string.
Test Data:
Input the string: Welcome to w3resource.com.
Expected Output:
The Highest frequency of character 'e' appears number of times: 4
Exercise 11
Write a C program to sort a string array in ascending order.
Test Data:
Input the string: w3resource
Expected Output:
After sorting the string appears like: 3ceeorrsuw
Exercise 12
Write a program in C to read a string through keyboard and sort it using bubble sort.
Test Data:
Input number of strings :3
Input string 3:
zero
one
two
Expected Output:
The strings appears after sorting: one two zero
Exercise 13
Write a program in C to extract a substring from a given string.
Test Data:
Input the string: this is test string
Input the position to start extraction: 9
Input the length of substring: 4
Expected Output:
The substring retrieve from the string is: "test"
Exercise 14
Write a C program to check whether a given substring is present in the given string.
Test Data:
Input the string: This is a test string.
Input the substring to be search: search
Expected Output:
The substring is not exists in the string.
Exercise 15
Write a program in C to read a sentence and replace lowercase characters by uppercase and vice-versa.
Test Data:
Input the string: This Is A Test String.
Expected Output:
The given sentence is: This Is A Test String. After Case changed the string is: tHIS iS a tEST sTRING.
Exercise 16
Write a program in C to find the number of times a given word 'the' appears in the given string.
Test Data:
Input the string: The string where the word the present more than once.
Expected Output:
The frequency of the word 'the' is: 3
Exercise 17
Write a program in C to remove characters in String Except Alphabets.
Test Data:
Input the string: w3resource.com
Expected Output:
After removing the Output String: wresourcecom
Exercise 18
Write a program in C to Find the Frequency of Characters.
Test Data:
Input the string: This is a test string
Input the character to find frequency: i
Expected Output:
The frequency of 'i' is: 3
Exercise 19
Write a program in C to Concatenate Two Strings Manually.
Test Data :
Input the first string: this is string one
Input the second string: this is string two
Expected Output:
After concatenation the string is: this is string one this is string two
Exercise 20
Write a program in C to find the largest and smallest word in a string.
Test Data:
Input the string: It is a string with smallest and largest word.
Expected Output:
The largest word is 'smallest' and the smallest word is 'a' in the string: 'It is a string with smallest and largest word.'.
Exercise 21
Write a program in C to convert a string to uppercase.
Test Data:
Input a string in lowercase: the quick brown fox jumps over the lazy dog
Expected Output:
Here is the above string in UPPERCASE : THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.
Exercise 22
Write a program in C to convert a string to lowercase.
Test Data:
Input a string in UPPERCASE: THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.
Expected Output:
Here is the above string in lowercase: the quick brown fox jumps over the lazy dog.
Exercise 23
Write a program in C to check whether a character is Hexadecimal Digit or not.
Test Data:
Input a character: 7
Expected Output:
The entered character is a hexadecimal digit.
Exercise 24
Write a program in C to check whether a letter is uppercase or not.
Test Data:
Input a character: p
Expected Output:
The entered letter is not an UPPERCASE letter.
Exercise 25
Write a program in C to replace the spaces of a string with a specific character.
Test Data:
Input a string: Be glad to see the back of Input replace character: *
Expected Output:
After replacing the space with * the new string is: Be*glad*to*see*the*back*of*
Exercise 26
Write a program in C to count the number of punctuation characters exists in a string.
Test Data:
Input a string: The quick brown fox, jumps over the, lazy dog.
Expected Output:
The punctuation characters exists in the string is: 3
Exercise 27
Write a program in C to print only the string before new line character.
Note: isprint() will only print line one, because the newline character is not printable.
Expected Output:
The quick brown fox
Exercise 28
Write a program in C to check whether a letter is lowercase or not.
Test Data:
Input a character: w
Expected Output:
The entered letter is a lowercase letter.
Exercise 29
Write a program in C to read a file and remove the spaces between two words of its content.
Expected Output:
The content of the file is: The quick brown fox jumps over the lazy dog After removing the spaces the content is: Thequickbrownfoxjumpsoverthelazydog
Exercise 30
Write a program in C to check whether a character is digit or not.
Test Data:
Input a character: 8
Expected Output:
The entered character is a digit.
Exercise 31
Write a program in C to split string by space into words.
Test Data:
Input a string: this is a test string
Expected Output:
Strings or words after split by space are :
this is a test string .
Exercise 32
Write a C programming to find the repeated character in a given string.
Test Data:
Input a string: w3resource
Expected Output:
Input a string: The first repetitive character in w3resource is: r
Exercise 33
Write a C programming to count of each character in a given string.
Test Data:
Input a string: w3resource
Expected Output:
Enter a str1ing: The count of each character in the string w3resource is w 1 3 1 r 2 e 2 s 1 o 1 u 1 c 1
Exercise 34
Write a C programming to convert vowels into upper case character in a given string.
Test Data:
Input a string: w3resource
Expected Output:
Input a sentence: The original string: w3resource After converting vowels into upper case the sentence becomes: w3rEsOUrcE
Source: W3resource, https://www.w3resource.com/c-programming-exercises/string/index.php
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