View Code of Problem 56

#include<stdio.h>
#include<string.h>
int main()
{
	int h1,m1,s1,h2,m2,s2;
	int sec1,sec2,s;
	scanf("%d:%d:%d",&h1,&m1,&s1);
	scanf("%d:%d:%d",&h2,&m2,&s2);
	sec1 = h1*3600 + m1*60 + s1;
	sec2 = h2*3600 + m2*60 + s2;
	s = sec1 > sec2 ? (sec1 - sec2) : (sec2 - sec1);

	printf("%d:%d:%d",s/3600,(s - s/3600 * 3600)/60,s%60);
	return 0;
}