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

int ispalindrome ( char s[] ) {
  int len=strlen(s);
  int i,j;

  for(i=0; i<len/2; i++ ) {
    j=len-i-1;
    if ( s[i] != s[j] ) {
      return 0;
    }
  }

  return 1;
}

int xispalindrome ( char s[] ) {
  char *rev;

  rev = malloc( strlen(s)*sizeof(char) );

  /* ... */
  
  return 0;
}

int main () {
  printf("%i\n", ispalindrome("hello") );
  printf("%i\n", ispalindrome("abba") );
  printf("%i\n", ispalindrome("abcba") );
  return 0;
}