View Code of Problem 56

#include <stdio.h>
#include <math.h>
int main()
{
	int a,b,c,d,e,f,sum;
	scanf("%d:%d:%d",&a,&b,&c);
    scanf("%d:%d:%d",&d,&e,&f);
	sum=fabs(a*60*60-d*60*60+b*60-e*60+c-f);
	printf("%d:%2d:%2d",sum/60/60,sum/60%60,sum%60);
	return 0;
}