今天日所学

 作业：

#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 << age <<endl;

        cout << *p <<endl;

    }

    //有参构造

    Person(int age,int num)

    {

        this->age=age;

        this->p=new int(num);

        cout <<"age:"<<age<<endl;

        cout <<"point:"<<*p <<endl;

    }

    //拷贝构造函数

    Person(Person &oth)

    {

        age=oth.age;

        p=new int(*oth.p);

    }

    //拷贝赋值函数

    Person &operator=(Person &pott)

    {

        if(this==&pott)

           return *this;

        age=pott.age;

        p=new int (* pott.p);

        return *this;

    }

    //析构函数

    ~Person()

    {

        delete p;

        p=nullptr;

    }

};

int main()

{

    Person *p1=new Person(12,43);

    Person *p2=new Person();

    Person *p3=p1;

    return 0;
}