继承 代码

#include <iostream>
	#define PI 3.14
	using namespace std;
	
	
class Shape
{

protected:
    double perimeter;
    double area;

public:
    Shape() {
        cout<<"Shape::无参构造"<<endl;
    }
    Shape(double perimeter,double area):perimeter(perimeter),area(area){
        cout<<"Shape::有参构造"<<endl;
    }
    ~Shape(){
        cout<<"Shape::析构函数"<<endl;
    }
    Shape(const Shape &other):perimeter(other.perimeter),area(other.area)
    {
        cout<<"Shape::拷贝构造"<<endl;
    }

    Shape& operator=(const Shape &other){
        if(this!=&other)
        {
            this->area = other.area;
            this->perimeter = other.perimeter;
        }

        cout<<"Shape::拷贝赋值"<<endl;
        return *this;
    }

};

class Circle:public Shape
{
private:
    double r;
public:
    Circle() {
        cout<<"Shape::无参构造"<<endl;
    }
    Circle(double r):r(r)
    {
        cout<<"Shape::有参构造"<<endl;
    }
    ~Circle()
    {
        cout<<"Shape::析构函数"<<endl;
    }
    Circle(const Circle &other):Shape(other.perimeter,other.area),r(other.r)
    {
        cout<<"Shape::拷贝构造"<<endl;
    }

    Circle& operator=(const Circle &other){
        if(this!=&other)
        {
            this->area = other.area;
            this->perimeter = other.perimeter;
            this->r = other.r;
        }
        cout<<"Shape::拷贝赋值"<<endl;
        return *this;
    }

    void get_c_s()
    {
        this->perimeter = 2*PI*this->r;
        this->area = PI*r*r;
        cout<<"周长是："<<this->perimeter<<endl;
        cout<<"面积是："<<this->area<<endl;
    }

};



class Rect:public Shape
{
private:
    double len;
    double wid;
public:
    Rect() {
        cout<<"Shape::无参构造"<<endl;
    }
    Rect(double len,double wid):len(len),wid(wid)
    {
        cout<<"Shape::有参构造"<<endl;
    }
    ~Rect()
    {
        cout<<"Shape::析构函数"<<endl;
    }

    Rect(const Rect &other):len(other.len),wid(other.wid)
    {
        cout<<"Shape::拷贝构造"<<endl;
    }

    Rect& operator=(const Rect &other){
        if(this!=&other)
        {
            this->len = other.len;
            this->wid = other.wid;
        }
        cout<<"Shape::拷贝赋值"<<endl;
        return *this;
    }

    void get_c_s()
    {
        this->perimeter = 2*(len+wid);
        this->area = len*wid;
        cout<<"周长是："<<this->perimeter<<endl;
        cout<<"面积是："<<this->area<<endl;
    }
};


int main()
{
    Circle c1(3);
    c1.get_c_s();

    //拷贝构造
    Circle c2 = c1;
    c2.get_c_s();

    //拷贝赋值
    Circle c3;
    c3 = c2;
    c3.get_c_s();

    cout<<"-----------------------------------"<<endl;

    Rect r1(4,6);
    r1.get_c_s();

    //拷贝构造
    Rect r2 = r1;
    r2.get_c_s();

    //拷贝赋值
    Rect r3;
    r3 = r2;
    r3.get_c_s();

    return 0;
}

思维导图