Reverse A Entered String.

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

char *strrev(char *str)
{
      char *p1, *p2;

      if (! str || ! *str)
            return str;
      for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
      {
            *p1 ^= *p2;
            *p2 ^= *p1;
            *p1 ^= *p2;
      }
      return str;
}

int main()
{
 char arr[100];
 
 printf("Enter a string to reverse\n");
 gets(arr);
 
 strrev(arr);
 
 printf("Reverse of entered string is \n%s\n",arr);
 
 return 0;
}

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