#include <iostream>using namespace std;class CSolid{public:    virtual double area() const=0;    virtual double volume() const=0;};class CCube:public CSolid{public:    CCube(double s):side(s) {}    virtual double area()const    {        return 6*side*side;    }    virtual double volume()const    {        return side*side*side;    }protected:    double side;};class CBall:public CSolid{public:    CBall(double r):R(r) {}    virtual double area()const    {        return 4*3.14*R*R;    }    virtual double volume()const    {        return 4/3*3.14*R*R*R;    }protected:    double R;};class CCylinder:public CSolid{public:    CCylinder(double r,double h):R(r),height(h) {}    virtual double area()const    {        return 3.14*R*R*2+2*3.14*R*height;    }    virtual double volume()const    {        return 3.14*R*R*height;    }protected:    double R;    double height;};int main(){    CCube c(4);    CBall b(2);    CCylinder cy(2,4);    CSolid *p[3]= {&c,&b,&cy};    cout<<"正方体的体积和表面积"<<endl;    cout<<"表面积"<<p[0]->area()<<endl;    cout<<"体积"<<p[0]-> volume()<<endl;    cout<<"球体的体积和表面积"<<endl;    cout<<"表面积"<<p[1]->area()<<endl;    cout<<"体积"<<p[1]-> volume()<<endl;    cout<<"圆柱体的体积和表面积"<<endl;    cout<<"表面积"<<p[2]->area()<<endl;    cout<<"体积"<<p[2]-> volume()<<endl;    cout << "" << endl;    return 0;}