hdu1065

http://acm.hdu.edu.cn/showproblem.php?pid=1065

错了n次了，让所有的水题汗颜啊！

#include"iostream"
using namespace std;
#define pi 3.1415926//3.1415927(wrong)
int main()
{
    int n;
    double a,b,sum;
     cin>>n;
    int i=0;
    while(n--)
    {
        cin>>a>>b;
        sum=pi*(a*a+b*b)/2;
        int x=(int)(sum/50)+1; //(int)sum/50+1(wrong)
        cout<<"Property "<<++i<<":"<<" This property will begin eroding in year "; 
        cout<<x<<"."<<endl;
    }
    cout<<"END OF OUTPUT."<<endl;
    return 0;
}