3.23作业

#include<iostream>
using namespace std;


class Cylinder{
public:
Cylinder(double r,double h);
void vol();
private:
double radius;
double hight;
double v;
};


Cylinder::Cylinder(double r,double h)
{
radius=r;
hight=h;
v=3.14*radius*radius*hight;
}


void Cylinder::vol()
{
cout<<"圆柱体的体积为:"<<v<<endl;
}


int main()
{
Cylinder cylinder1(2,2);
cylinder1.vol();
return 0;




}