改成这样看看
>#include<iostream.h>
> double jiechen(int n,int k)
> {
> 	if(k==1)
> 		return (n);
> 	return jiechen(n-1,k-1)*n;
> }
> void main()
> {
> 	int n,k;
> 	while(1)
> 	{
> 		cin>>n>>k;
>                 if(n==0&&k==0)
> 		     return;

> 		if((n!=0)&&(k==0))
> 			cout<<"1"<<endl;
> 		else
> 		    cout<<long(jiechen(n,k)/jiechen(k,k)+0.5)<<endl;
> 	}
> }
>