第13周项目4-立体类族共有的抽象类

来源：互联网发布：windows中的粘滞键是编辑：程序博客网时间：2024/05/16 05:04
#include "iostream"using namespace std;const double pai=3.1415926;// 抽象立体图形基类class CSolid{public:    virtual double SurfaceArea() const=0;    virtual double Volume() const=0;};// 立方体类class CCube : public CSolid{public:    CCube(double len=0);    double SurfaceArea() const;   // 求表面积    double Volume() const;        // 求体积private:    double length;};// 立方体类构造函数CCube::CCube(double len){    length=len;}// 求立方体表面积double CCube::SurfaceArea() const{    double c;    c=6*length*length;    return c;}// 求立方体体积double CCube::Volume() const{    double c;    c=length*length*length;    return c;}// 球体类class CBall : public CSolid{private:    double radius;            // 圆周率public:    CBall(double r=0);    double SurfaceArea() const;  // 求表面积    double Volume() const;       // 求体积;};// 球体类构造函数CBall::CBall(double r){    radius=r;}// 求球体表面积double CBall::SurfaceArea() const{    double c;    c=4*pai*radius*radius;    return c;}// 求球体体积double CBall::Volume() const{    double c;    c=pai*radius*radius*radius*4/3;    return c;}// 圆柱体类class CCylinder : public CSolid{private:        double radius;    double height;public:    CCylinder(double r=0,double high=0);    double SurfaceArea() const;       // 求表面积    double Volume() const;            // 求体积};// 圆柱体类构造函数CCylinder::CCylinder(double r,double high){    radius=r;    height=high;}// 求圆柱体表面积double CCylinder::SurfaceArea() const{    double c;    c=2*pai*radius*radius+2*pai*radius*height;    return c;}// 求圆柱体体积double CCylinder::Volume() const{    double c;    c=pai*radius*radius*height;    return c;}int main( ){    CSolid *p;    double s,v;    CCube x(30);    cout<<"立方体边长为 30 "<<endl;    p=&x;    s=p->SurfaceArea( );    v=p->Volume( );    cout<<"表面积："<<s<<endl;    cout<<"体积："<<v<<endl;    cout<<endl;    CBall y(4.5);    cout<<"球体半径为 4.5 "<<endl;    p=&y;    s=p->SurfaceArea( );    v=p->Volume( );    cout<<"表面积："<<s<<endl;    cout<<"体积："<<v<<endl;    cout<<endl;    CCylinder z(10,20);    cout<<"圆柱体底面半径、高分别为 10, 20"<<endl;    p=&z;    s=p->SurfaceArea( );    v=p->Volume( );    cout<<"表面积："<<s<<endl;    cout<<"体积："<<v<<endl;    cout<<endl;    return 0;}
运行结果：
1 0