View Code of Problem 56

#include <stdio.h>
#include <math.h>
#include <string.h>
int main()
{
	int a, b, c, d, e, f;
	scanf("%d:%d:%d", &a, &b, &c);
	scanf("%d:%d:%d", &d, &e, &f);
	int m, n, h;
	m = 3600 * a + 60 * b + c;
	n = 3600 * d + 60 * e + f;
	if (m - n > 0) {
		h = m - n;
	}
	else
	{
		h = n - m;
	}
	a = h / 3600;
	b = (h /60) % 60;
	c = h % 60;
	printf("%d:%02d:%02d\n", a, b, c);
	return 0;
}