View Code of Problem 56

#include "stdio.h"
#include "string.h"

void main()
{
	int a,b,c;
	int x,y,z;
	int cha;
	char c1,c2;
	scanf("%2d%c%2d%c%2d",&a,&c1,&b,&c2,&c);
	scanf("%2d%c%2d%c%2d",&x,&c1,&y,&c2,&z);
	cha=a*3600+b*60+c-x*3600-y*60-z;
	if(cha<0)
		cha=-cha;
	a=cha/3600;
	cha=cha%3600;
	b=cha/60;
	cha=cha%60;
	printf("%d:%02d:%02d",a,b,cha);

}