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谁能帮我看看为何会Compile Error ?且点进去后只有"Compile Error"字样而没有告诉你怎么错?

Posted by weilun at 2010-01-21 00:26:21 on Problem 2453
#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int k,n,zero,one,a[1000];
	double ans;
	while(cin>>k&&k)
	{
	        ans=k;
		for(n=0;k;++n)
		{
			a[n+1]=k%2;
			k/=2;
		}

		zero=0;
		one=0;
		while(!a[++zero]);
                zero--;
		one=zero;
		while(a[++one]&&one<=n);
		one--;

		ans+=pow(2.0,zero);
		ans+=pow(2.0,one-zero-1)-1;
		cout<<ans<<endl;
	}
	return 0;
}

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