C++——从一个正方体类(Cube)和球体类(Sphere),派生出圆柱体类(Cylinder)，设计成员函数，能够输出正方体、球体、圆柱体的面积和体积。

没注释的源代码

#include <iostream>

using namespace std;

class Cube

{

public:

    Cube(int a):a(a){}

    void Cube_area()

    {

        cout<<"正方体的面积："<<a*a<<endl;

    }

    void Cube_tiji()

    {

        cout<<"正方体的体积："<<a*a*a<<endl;

    }

protected:

    double a;

};

class Sphere

{

public:

    Sphere(int r):r(r){}

    void Sphere_area()

    {

        cout<<"球体的面积："<<3.14*r*r*4<<endl;

    }

    void Sphere_tiji()

    {

        cout<<"球体的体积："<<4/3*3.14*r*r*r<<endl;

    }

protected:

    double r;

};

class Cylinder:public Cube,public Sphere

{

public:

    Cylinder(int a,int r):Cube(a),Sphere(r){}

    void Cylinder_area()

    {

        cout<<"圆柱体的面积："<<(3.14*r*r+a*a)*2<<endl;

    }

    void Cylinder_tiji()

    {

        cout<<"圆柱体的体积："<<3.14*r*r*a<<endl;

    }

};

int main()

{

    Cube c1(3);

    c1.Cube_area();

    c1.Cube_tiji();

    Sphere s1(5);

    s1.Sphere_area();

    s1.Sphere_tiji();

    Cylinder c2(3,5);

    c2.Cylinder_area();

    c2.Cylinder_tiji();

    return 0;

}