// ex_ch5_1.c
#include <stdio.h>
#define PROMPT "Enter minute value to convert to hours (or zero to quit)\n"

const int MINUTES_PER_HOUR = 60;

int main(void)
{
	int minutes, hours, remaining;
	printf(PROMPT);
	scanf("%d", &minutes);

	while (minutes > 0)
	{
		hours = minutes / MINUTES_PER_HOUR;
		remaining = minutes % MINUTES_PER_HOUR;
		printf("%d minutes are %d:%02d hours.\n", 
			minutes, hours, remaining);

		printf("\n");
		printf(PROMPT);
		scanf("%d", &minutes);
	}

	return 0;
}