#include<iostream>
using namespace std;
#define PI 3.14
class cylinder
{
public:
cylinder(double x,double y)
{
r=x;
h=y;
v=PI*r*r*h;
cout<<"圆柱体体积为:"<<v<<endl;
}
private:
double r,h,v;
};
int main(){
int x,y;
cin>>x>>y;
cylinder a(x,y);
}