nyoj-球的体积

四舍五入的技巧

#include <iostream>
using namespace std;

const double PI = 3.1415926;
int main()
{
    float r;
    while(cin >> r)
    {
              cout << int(4*PI*r*r*r/3 +0.5) << endl;
              }
    return 0;
}