求圆的面积，球儿的体积

#include<iostream>
using namespace std;
#define pi 3.14159 // const double pi=3.14159
int main()
{
    
    
double square=0,volume=0,radius=0;
cin >> radius;
square=3.14159*radius*radius;
volume=4*3.14159*radius*radius*radius/3;
cout <<"square="<<square <<"volume=" <<volume<< endl;
return 0;
}