【DAY3】类，构造函数

 

#include<iostream>
using namespace std;
class Person
{
private:
    int age;
    int *p;
public:
    Person():p(new int(89))
    {
        age=18;
    }
    Person(int age,int num)
    {
        this->age=age;
        this->p=new int(num);
    }
    //拷贝构造
    Person(Person &other):age(other.age),p(new int(*(other.p)))
    {
        cout<<"拷贝构造"<<endl;
    }
    //拷贝赋值
    Person &operator=(Person &other)
    {
        age=other.age;
        *p=*(other.p);
        cout<<"拷贝赋值"<<endl;
        return *this;
    }

    void show()
    {
        cout << "age = " << age << endl;
        cout << "p = " << *p << endl;
        cout<< p<<endl;
    }

    //析构
    ~Person()
    {
        delete p;
        cout<<"析构"<<endl;
    }
};
int main()
{
    int *num=new int(100);
    Person p1(10,*num);
    p1.show();
    Person p2=p1;
    p2.show();
    Person p3;
    p3=p2;
    p3.show();

    return 0;
}