View Code of Problem 56

#include<stdio.h>
#include<string.h>
struct time{
int h;
int m;
int s;
}t1,t2,t3,temp;
int main()
{
	int i,j;
	scanf("%2d:%2d:%2d",&t1.h,&t1.m,&t1.s);
    scanf("%2d:%2d:%2d",&t2.h,&t2.m,&t2.s);
    if(t1.h>t2.h)
	{
	temp=t1;
	t1=t2;
	t2=temp;
	}

if(t2.s>t1.s)
{
t3.s=t2.s-t1.s;
}
else
{
t3.s=t2.s+60-t1.s;
if(t2.m>0)
t2.m=t2.m-1;
else{
t2.m=t2.m+60-1;
t2.h-=1;
}
}
if(t2.m>t1.m)
{
t3.m=t2.m-t1.m;
}
else
{
t3.m=t2.m+60-t1.m;
if(t2.h>0)
t2.h=t2.h-1;
}
if(t2.h>=t1.h)
{
t3.h=t2.h-t1.h;
}
printf("%d:%02d:%02d",t3.h,t3.m,t3.s);
}