#include <stdio.h>


int strcmp( char s1[], char s2[] )
{
   /* ----------------------------------
      '\0' marks the end of the string !
      ---------------------------------- */
   while ( *s1 != '\0' && *s2 != '\0' &&  *s1 == *s2 )
   {
       s1++;
       s2++;
   }

   return *s1 - *s2; 
}

int main(int argc, char *arg[])
{
   char a[] = "Hell";
   char b[] = "Hello";
   char c[] = "Hellx";

   
   printf("strcmp(%s, %s) = %d\n", b, b, strcmp(b, b) );
   printf("strcmp(%s, %s) = %d\n", b, a, strcmp(b, a) );
   printf("strcmp(%s, %s) = %d\n", b, c, strcmp(b, c) );

}