#include
using namespace std;
#define PI 3.141592
class Cylinder {
private:
double r;
double h;
double v;
public:
Cylinder(double ir, double ih) {
r = ir;
h = ih;
v = PI*r*r*h;
}
void vol() {
cout << "volume is: " << v << endl;
}
};
int main() {
double r, h;
cin >> r;
cin >> h;
(new Cylinder(r, h))->vol();
return 0;
}
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