实现一个图形类（Shape），包含受保护成员属性：周长、面积，

公共成员函数：特殊成员函数书写

定义一个圆形类（Circle），继承自图形类，包含私有属性：半径

公共成员函数：特殊成员函数、以及获取周长、获取面积函数

定义一个矩形类（Rect），继承自图形类，包含私有属性：长度、宽度

公共成员函数：特殊成员函数、以及获取周长、获取面积函数

在主函数中，分别实例化圆形类对象以及矩形类对象，并测试相关的成员函数。

#include <iostream>using namespace std;
class Shape
{
protected:double round;double area;
public:Shape(){cout<<"无参构造"<<endl;}Shape(double r,double a):round(r),area(a){cout<<"有参构造"<<endl;}~Shape(){cout<<"析构函数"<<endl;}Shape(const Shape &other):round(other.round),area(other.area){cout<<"拷贝构造"<<endl;}Shape & operator=(const Shape &other){this->area=other.area;this->round=other.round;cout<<"拷贝赋值"<<endl;return *this;}Shape & operator=(Shape &&other){this->area=other.area;this->round=other.round;cout<<"移动赋值"<<endl;return *this;}};
class Circle:public Shape
{
private:double bj;
public:Circle() {}Circle(double r):bj(r){cout<<"有参构造"<<endl;}~Circle(){cout<<"析构函数"<<endl;}Circle(const Circle &other):Shape(other.round,other.area),bj(other.bj){cout<<"拷贝构造"<<endl;}Circle & operator=(const Circle &other){this->area=other.area;this->round=other.round;this->bj=other.bj;cout<<"拷贝赋值"<<endl;return *this;}Circle & operator=(Circle &&other){this->area=other.area;this->round=other.round;this->bj=other.bj;cout<<"移动赋值"<<endl;return *this;}void zc(){this->round=this->bj*2*(3.14);cout<<"周长="<<round<<endl;}void mj(){this->area=this->bj*this->bj*(3.14);cout<<"面积="<<area<<endl;}void show(){cout<<"周长="<<round<<endl;cout<<"面积="<<area<<endl;}
};
class Rect:public Shape
{
private:double hight;double wight;
public:Rect() {}Rect(double h,double w):hight(h),wight(w){cout<<"有参构造"<<endl;}~Rect(){cout<<"析构函数"<<endl;}Rect(const Rect &other):Shape(other.round,other.area),hight(other.hight),wight(other.wight){cout<<"拷贝构造"<<endl;}Rect & operator=(const Rect &other){this->area=other.area;this->round=other.round;this->hight=other.hight;this->wight=other.wight;cout<<"拷贝赋值"<<endl;return *this;}Rect & operator=(Rect &&other){this->area=other.area;this->round=other.round;this->hight=other.hight;this->wight=other.wight;cout<<"移动赋值"<<endl;return *this;}void zc(){this->round=(this->hight+this->wight)*2;cout<<"周长="<<round<<endl;}void mj(){this->area=this->hight*this->wight;cout<<"面积="<<area<<endl;}void show(){cout<<"周长="<<round<<endl;cout<<"面积="<<area<<endl;}
};
int main()
{Circle c1(10);c1.zc();c1.mj();Circle c2(c1);c2.show();Circle c3;c3=c1;c3.show();Circle c4;c4=move(c3);c3.show();c4.show();cout<<"******************************************"<<endl;Rect r1(10,5);r1.mj();r1.zc();Rect r2=r1;r2.show();Rect r3;r3=r1;r3.show();return 0;
}