#include <stdio.h>
#include <time.h>
#include <unistd.h>

int main()
{
	time_t t;
	time_t next;

	while (1) {
		t = time(NULL);
		next = t - (t%3600) + 3600;
		fprintf(stderr, "T-%ds and counting    \r", next - t);
		usleep(20000);
	}
}