2、

 

#include <iostream>

using namespace std;

class Person
{
private:
    int age;
    int *p;
public:
    //无参构造
    Person():p(new int(89))
    {
        age = 18;
    }
    //有参构造
    Person (int age,int num)
    {
        this->age = age;
        this-> p = new int(num);
    }
    //拷贝构造函数(深度拷贝)
    Person(Person &other)
    {
        age = other.age;
        *p = *(other.p);
    }

    //拷贝赋值函数
    Person &operator=(Person &other)
    {
        if(this != &other)
        {
            age = other.age;
            *p = *(other.p);
        }
        return *this;
    }

    void show()
    {
        cout << "age = "<< age <<endl;
        cout << "address = " << &p << endl;
    }
    //析构函数
    ~Person()
    {
        delete p;
        p = nullptr;
        cout << "析构函数调用" << endl;
    }
};

int main()
{
    Person p1 (20,100);
    cout << "p1 :";
    p1.show();
    cout <<endl;

    Person p2 = p1;
    cout << "拷贝函数p2 :";
    p2.show();
    cout <<endl;

    Person p3;
    p1 = p3;
    cout << "拷贝赋值函数 : ";
    p1.show();
    cout <<endl;


    return 0;
}

 运行效果如下