vc++相关程序问题

vc++相关程序问题 以及 其多态性实践相关问题……谢谢了……利用虚函数……

代码如下：

#include <iostream>
using namespace std;

class Shape
{
protected:
    float x, y;
    float vol;
public:
    virtual void disp() { vol = 0; }
    virtual void print() { cout << "体积为" << vol << endl; }
};

class Zhengfangti :public Shape
{

public:
    Zhengfangti(float v) { x = v; }
    void disp() { vol = x * x * x; }
    void print() { cout <<"边长为"<<x << "的正方体的体积：" << vol<<endl; }
};

class Circle :public Shape
{
public:
    Circle(float r) { x = r; }
    void disp() { vol = 4.0 / 3 * 3.14 * x * x * x; }
    void print() { cout << "半径为" << x << "的球的体积为：" << vol<<endl; }
};

class Yuanzhuti :public Shape
{
public:
    Yuanzhuti(float r, float h) { x = r, y = h; }
    void disp() { vol = 3.14*x*x*y; }
    void print() { cout << "半径为" << x << "的圆柱体的体积为：" << vol<<endl; }
};

int main()
{
    Zhengfangti z(2);
    z.disp();
    z.print();
    Circle c(3);
    c.disp();
    c.print();
    Yuanzhuti y(2, 3);
    y.disp();
    y.print();
    return 0;
}

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