C Program to Check whether a given String is Palindrome or not using Recursion

The following C program, with recursion, determines whether the entered string is a palindrome or not. A palindrome is a word, phrase or sentence that reads the same backward or forward.

Here is the source code of the C program to display a linked list in reverse. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C Program to Check whether a given String is Palindrome or not 
  3.  * using Recursion
  4.  */
  5. #include <stdio.h>
  6. #include <string.h>
  8. void check(char [], int);
  10. int main()
  11. {
  12.     char word[15];
  14.     printf("Enter a word to check if it is a palindrome\n");
  15.     scanf("%s", word);
  16.     check(word, 0);
  18.     return 0;
  19. }
  21. void check(char word[], int index)
  22. {
  23.     int len = strlen(word) - (index + 1);
  24.     if (word[index] == word[len])
  25.     {
  26.         if (index + 1 == len || index == len)
  27.         {
  28.             printf("The entered word is a palindrome\n");
  29.             return;
  30.         }
  31.         check(word, index + 1);
  32.     }
  33.     else
  34.     {
  35.         printf("The entered word is not a palindrome\n");
  36.     }
  37. }}

$ gcc palindrome.c -o palindrome
$ a.out
Enter a word to check if it is a palindrome
The entered word is a palindrome

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If you wish to look at other example programs on Strings, go to C Programming Examples on Strings. If you wish to look at programming examples on all topics, go to C Programming Examples.
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