/* Function strncmp(s,t,n) to compare at most n characters and return the
   difference of the characters at the first position where s and t
   disagree. (using pointers) */

#include <stdio.h>

int strncmp(char *s, char *t, int n);

main()
{
        printf("%d\n",strncmp("hello","hello world",5));
}

int strncmp(char *s, char *t, int n)
{
        for(; *s==*t && (*s || *t) && --n; s++,t++)
		;
	return *s - *t;
}