View Code of Problem 56

# include<stdio.h>
int main(void)
{
  int h1,m1,s1,h2,m2,s2,h3,m3,s3,t1,t2,t;
  scanf("%d:%d:%d",&h1,&m1,&s1);
  scanf("%d:%d:%d",&h2,&m2,&s2);
  t1 = h1*3600+m1*60+s1;
  t2 = h2*3600+m2*60+s2;
  if(t1>t2)
  {
    t = t1;
    t1 = t2;
    t2 = t;
  }
  t = t2 - t1;
  h3 = t/3600;
  m3 = (t%3600)/60;
  s3 = (t%3600)%60;
  printf("%d:%02d:%02d",h3,m3,s3);
  return 0;
}