有以下类定义，按要求实现剩余功能

 

#include <iostream>
using namespace std;

class Person
{
private:
    int age;
    int *p;
public:
    //无参构造
    Person():p(new int(89))
    {
        age = 18;
        cout << "无参构造" << endl;
    }
    //有参构造
    Person(int age,int num)
    {
        this->age = age;
        this->p=new int(num);
        cout << "有参构造" << endl;
    }
    //拷贝构造函数
    Person(Person &other)
    {
        age=other.age;
        p=new int(*(other.p));//开辟新的空间，深拷贝
        cout << "拷贝构造函数" << endl;
    }
    //拷贝赋值函数
    Person &operator=(Person &other)
    {
        if(this!=&other)
        {
            age=other.age;
            //构造函数已经开辟空间
            *p=*(other.p);
            cout << "拷贝赋值函数" << endl;
        }
    }
    //析构函数
    ~Person()
    {
        delete p;
        p=nullptr;
        cout << "析构函数" << endl;
    }
    void show()
    {
        cout << p << endl;
    }
};

int main()
{
    int num=180;
    Person str1(18,num);
    Person str2=str1;//str2调用拷贝构造函数
    //拷贝赋值函数
    Person str3;
    str3=str2;
    return 0;
}