#include <stdio.h>
int my_strcmp();

main()
{
	char s[1000], t[1000];
	int  i;
	printf("Input 2 strings:");
	gets(s);
	printf("Another string:");
	gets(t);
	i=my_strcmp(s,t);
	if(i) printf("They are different at the %dth char.\n", i);
	else printf("They are identical.\n");
}

int my_strcmp(char *s, char *t)
{
	int i, j=0;
	for(i=0;;i++)
		if(s[i]==0 || t[i]==0) break;
		else if(s[i]!=t[i]) {
			j=++i;
			break;
		}
	return(j);
}