/* Programmed by Kurt Nørmark, April 2003 */

#include <stdio.h>

void swap(char *p, char *q){
   char   tmp;

   tmp = *p;
   *p = *q;
   *q = tmp;
}

void string_reverse(char *s){
  char *s_front, *s_rear;

  for (s_front = s, s_rear =  s + strlen(s) - 1;
       s_front < s_rear;
       s_front++, s_rear--)
    swap(s_front, s_rear);
}

int main(void) {

  char str[] = "computer"; 

  printf("%s\n", str);
  string_reverse(str);
  printf("%s\n", str);
  
  return 0;
}