第十四周【项目3-立体类族共有的抽象类】-优快云博客

本文链接：https://blog.youkuaiyun.com/u012369140/article/details/27171769

本文通过C++代码展示了如何使用面向对象的方法抽象出三维几何体类，并具体实现了立方体、球体和圆柱体的类。这些类能够计算各自对应的表面积和体积。

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#include<iostream>
using namespace std;
class CSolid
{
public:
    virtual double area() const =0;
    virtual double vv() const =0;
};
class CCube:public CSolid
{
private:
    double r;
public:
    CCube(double rr):r(rr){};
    virtual double area() const
    {
        return r*r*6;
    }
    virtual double vv() const
    {
        return r*r*r;
    }
};
class CBall:public CSolid
{
private:
    double r;
public:
    CBall(double rr1):r(rr1){};
    virtual double area() const
    {
        return 4*3.14*r*r;
    }
    virtual double vv() const
    {
        return (4/3)*r*r*r*3.14;
    }
};
class CCylinder:public CSolid
{
private:
    double r;
    double h;
public:
    CCylinder(double rr,double hh):r(rr),h(hh){};
    virtual double area() const
    {
        return 3.14*r*r*2+2*3.14*r*h;
    }
    virtual double vv() const
    {
        return 3.14*r*r*h;
    }
};
int main()
{
    CSolid *p;
    double s,v;
    CCube x(3);
    cout<<"立方体边长为 3 "<<endl;
    p=&x;
    s=p->area( );
    v=p->vv( );
    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->area( );
    v=p->vv( );
    cout<<"表面积："<<s<<endl;
    cout<<"体积："<<v<<endl;
    cout<<endl;
    CCylinder z(1,2);
    cout<<"圆柱体底面半径、高分别为 1, 2"<<endl;
    p=&z;
    s=p->area( );
    v=p->vv( );
    cout<<"表面积："<<s<<endl;
    cout<<"体积："<<v<<endl;
    cout<<endl;
    return 0;

}

运行结果