strrev -- Reverse String

Format

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

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

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

Example
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;
   /* 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                          */
   return (strcmp(string, strrev(string2)));
}
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 -- Concatenate Strings
strcmp -- Compare Strings
strcpy -- Copy Strings
strdup -- Duplicate String
strnset - strset -- Set Characters in String
<string.h>