Syntax

#include <string.h>
char *strrev(char *string);

strrev reverses the order of the characters in the given string. The ending null character (\0) remains in place.

strrev returns a pointer to the altered string. There is no error return value.

This example determines whether a string is a palindrome. A palindrome is a string that reads the same forward and backward.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int palindrome(char *string)
{
   char *string2;
   int  rc;

   /* Duplicate string for comparison                                         */

   if (NULL == (string2 = strdup(string))) {
      printf("Storage could not be reserved for string\n");
      exit(EXIT_FAILURE);
   }

   /* If result equals 0, the string is a palindrome                          */

   rc = strcmp(string), strrev(string2));
   free(string2);
   return rc;
}

int main(void)
{
   char string[81];

   printf("Please enter a string.\n");
   scanf("%80s", string);
   if (palindrome(string))
      printf("The string is not a palindrome.\n");
   else
      printf("The string is a palindrome.\n");
   return 0;

   /****************************************************************************
      Sample output from program:

      Please enter a string.
      level
      The string is a palindrome.
      ... or ...
      Please enter a string.
      levels
      The string is not a palindrome.
   ****************************************************************************/
}

• strcat
  
• strcmp
  
• strcpy
  
• strdup
  
• strnset - strset

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