timer written in C for my Advanced Computing class

timer.c

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

int main(int argc, char* argv[]) {
	int time = 1;
	if (argc > 2) {
		printf("Too many arguments.\nusage: %s <end time in seconds>\n",argv[0]);
		exit(0);
	}
	if (argc == 2) {
		if(strcmp(argv[1],"-h") == 0 || strcmp(argv[1],"--help") == 0) {
			printf("usage: %s <end time in seconds>\n",argv[0]);
			return 0;
		}
		int quitTime = atoi(argv[1]);
		for(int i = 0;i < quitTime;i++) {
			system("clear");
			printf("%d\n",i+1);
			sleep(time);
		}
		return 0;
	} else {
		for(int i = 1;i > 0;i++) {
			system("clear");
			printf("%d\n",i);
			sleep(time);
		}
	}
	return 0;
}