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Re:哪位高手给看一下吧,怎么是RE?给的数据都测过了

Posted by HCman at 2008-11-20 22:10:21 on Problem 1565 and last updated at 2008-11-20 22:13:30
In Reply To:哪位高手给看一下吧,怎么是RE?给的数据都测过了 Posted by:Greepry at 2008-11-20 21:41:45
> #include<iostream>
> #include<cmath>
> using namespace std;
> int main()
> {
> 	char a;
> 	double sum;
> 	int i,j,s=1,num[50];
> 	while(s>0)
> 	{
> 		s=0;
> 		for(i=0;;i++)
> 		{
> 			a=cin.get();
> 			if(a=='\n') break;
> 			else 
> 			{
> 				num[i]=a-48;
> 				s+=num[i];
> 			}
> 		}
> 		if(s==0) break;
> 		sum=0;
> 		for(j=0;j<i;j++) sum+=num[j]*(pow((float)2,i-j)-1);
> 		cout << sum << endl;
> 	};
> 	system("pause");
> }
你这个1.system("pause")没必要吧,2.你求2^i的时候用浮点数有误差吧,你可以先把2^i存在一个整形数组中嘛,不放心的话用__in64或者用unsigned __int64嘛,不多,

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