wustojc2011计算终止时间

#include 
int main()
{
  int n,m,a,b,c,d;
  scanf("%d%d",&n,&m);
  a=n%100;
  c=0;
  b=a+m;
  while(b>60&&b>0)
  {b=b-60;
   c++;}
  while(b<0)
  {b=b+60;
   c--;}
  d=n/100+c;
  if(d>24)
    d=d-24;
  printf("%d%02d",d,b);
  return 0;
}