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

#define MAXLEN 1000

void flcmp(FILE *fp1, FILE *fp2);

int main(int argc, char *argv[])
{
	FILE *fp1, *fp2;
	
	if (argc != 3) {
		fprintf(stderr, "Usgae: %s file1 file2\n", *argv);
		return 1;
	} else if (!(fp1 = fopen(argv[1], "r")) || !(fp2 = fopen(argv[2], "r"))) {
		fprintf(stderr, "%s: unable to read files\n", *argv);
		return 1;
	} else {
		flcmp(fp1, fp2);
		return 0;
	}
}

void flcmp(FILE *fp1, FILE *fp2)
{
	char l1[MAXLEN], l2[MAXLEN];

	while (fgets(l1, MAXLEN, fp1) && fgets(l2, MAXLEN, fp2)) {
		if (strcmp(l1, l2)) {
			printf(">>> %s", l1);
			printf("<<< %s", l2);
			break;
		}
	}
}