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用double

Posted by frkstyc at 2005-04-24 15:42:18 on Problem 2249
In Reply To:为什么老是wa，请帮忙 Posted by:cpp050800448144 at 2005-04-24 15:41:28 
> #include<iostream.h>
> void main()
> {
> 	long n,k,sum;
> 	while(1)
> 	{
> 		sum=1;
> 		cin>>n>>k;
> 		if(n==0&&k==0)
> 			break;
> 		if(k>n/2)
> 			k=n-k;
> 		for(long i=1;i<=k;i++)
> 		{
> 			sum*=n+1-i;
> 			sum/=i;
> 		}
> 		cout<<sum<<endl;
> 	}
> }
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