C Programming Exercises, Practice, Solution : String
C String [41 exercises with solution]
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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
2. Write a program in C to find the length of a string without using library functions.
Test Data :
Input the string : w3resource.com
Expected Output :
Length of the string is : 15
3. Write a program in C to separate individual characters from a string.
Test Data :
Input the string : w3resource.com
Expected Output :
The characters of the string are : w 3 r e s o u r c e . c o m
4. Write a program in C to print individual characters of a 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
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
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.
7. Write a program in C to count the 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
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
9. Write a program in C to count the total number of vowels or consonants 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
10. Write a program in C to find the maximum number of characters 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
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
12. Write a program in C to read a string from the 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
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 "
14. Write a C program to check whether a substring is present in a 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.
15. Write a program in C to read a sentence and replace lowercase characters with 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.
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
17. Write a program in C to remove characters from a string except alphabets.
Test Data :
Input the string : w3resource.com
Expected Output :
After removing the Output String : wresourcecom
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
19. Write a program in C to combine 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
20. Write a program in C to find the largest and smallest words 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.'.
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.
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.
23. Write a program in C to check whether a character is a Hexadecimal Digit or not.
Test Data :
Input a character : 7
Expected Output :
The entered character is a hexadecimal digit.
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.
25. Write a program in C to replace the spaces in 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*
26. Write a program in C to count the number of punctuation characters present 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
27. Write a program in C to print only the string before the new line character.
Note: isprint() will only print line one, because the newline character is not printable.
Expected Output :
The quick brown fox
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.
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
30. Write a program in C to check whether a character is a digit or not.
Test Data :
Input a character : 8
Expected Output :
The entered character is a digit.
31. Write a program in C to split strings 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 .
32. Write a C program to find the repeated character in a string.
Test Data :
Input a string: w3resource
Expected Output:
Input a string: The first repetitive character in w3resource is: r
33. Write a C program to count 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
34. Write a C program to convert vowels into uppercase characters in a 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
35. Write a C program to find the length of the longest substring of a given string without repeating characters.
Test Data :
Input a string: “abcddefffd”
Expected Output:
Input a string: Length of the longest substring without repeating characters: 4
36. A given string contains the bracket characters '(', ')', '{', '}', '<', ‘>', '[' and ']', Write a C program to check if the string is valid or not. The input string will be valid when open brackets and closed brackets are same type of brackets.
Test Data :
Input a string: <>()[]{}
Expected Output:
Check bracket in the said string is valid or not? 1
37. Write a C program to multiply two positive numbers as strings. Return a string representation of the product.
Expected Output:
Original numbers: 100 and 15 Multiple two said numbers represent as string? 1500
38. Write a C program to reverse all the vowels present in a given string. Return the newly created string.
Test Data :
Input a string: “AEIou”
Expected Output:
Input a string: Check bracket in the said string is valid or not? “uoIEA”
39. Write a C program to find the longest palindromic substring from a given string. Return the substring.
Expected Output:
Original string: abcdcsdfabbccb Longest Palindromic Substring from the said string? bccb
40. Write a C program to replace each lowercase letter with the same uppercase letter of a given string. Return the newly created string.
Sample Data:
("Python") -> "PYTHON"
("abcdcsd") -> "ABCDCSD"
41. Write a C program to calculate the length of the longest common subsequence of two given strings. The strings consist of alphabetical characters.
Sample Data:
("abcdkiou", "cabsdf") -> 3
("pqrjad", "qr") -> 2
C Programming Code Editor:
More to Come !
Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.
C Programming: Tips of the Day
It is more efficient to use if-return-return or if-else-return?
Since the return statement terminates the execution of the current function, the two forms are equivalent (although the second one is arguably more readable than the first).
The efficiency of both forms is comparable, the underlying machine code has to perform a jump if the if condition is false anyway.
Note that Python supports a syntax that allows you to use only one return statement in your case:
return A+1 if A > B else A-1
Ref : https://bit.ly/2S4P2he
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