View Code of Problem 56

#include<stdio.h>
#include<math.h>
int main(){
	int h1,h2,m1,m2,s1,s2,sum;
	scanf("%d:%d:%d%d:%d:%d",&h1,&m1,&s1,&h2,&m2,&s2);
	sum=abs(h1*3600+m1*60+s1-h2*3600-m2*60-s2);
	printf("%d:%02d:%02d\n",sum/3600,(sum/60)%60,sum%60);
}