/*
 * show two clocks starting from 5 minutes, countdown in seconds to 0.
 * one clock runs at a time, use a signal or keypress to switch clocks.
 */
#include <stdio.h>
#include <unistd.h>

int
main()
{
	int i;

	/* 5 min * 60sec = 300sec */
	for (i = 300; i > 0; --i) {
		sleep(1);
		printf("\r%d", i);
		fflush(stdout);
	}
	return 0;
}