C++第四天

//主程序
#include"stuper.h"
int main()
{
    cout<<boolalpha<<endl;
    string name="lisi";
    //Person p;
    Person p1(23,18,name);//自动调用有参构造
    p1.show();
    Person p2=p1;//自动调用拷贝构造函数
    p2.show();
    Person p3(p2);//自动调用拷贝构造函数
    p3.show();
    Person q1(10,20,name);

    Person q2(6,15,name);
    Person q3=q1+q2;
    q3.show1();
    //插入<<运算符重载
    cout<<"p1:"<<p1<<endl;

    if(q1>q2)
    {
        cout<<"q1>q2"<<endl;
    }
    q1=q2++;
    q2.show();
    q1.show();
    Person p5;
    cin>>p5;
    cout<<"p5:"<<p5<<endl;

    cout<<"============================================"<<endl;
    Stu s1;//自动调用无参构造
    Stu s2(88);//自动调用有参构造
    s2.show();
    Stu s3=s2;//自动调用拷贝构造函数
    s3.show();
    Stu s4(s3);//自动调用拷贝构造函数
    s4.show();

    s1=s2;
    s1.show();
    return 0;
}

//头文件
#ifndef STUPER_H
#define STUPER_H
#include <iostream>
using namespace std;
class Person;
const Person operator++(Person &O,int);
ostream &operator<<(ostream &cout, const Person &p);
istream &operator>>(istream &cin, Person &p);

class Person
{
    friend istream &operator>>(istream &cin, Person &p);
    friend const Person operator++(Person &O,int);
    friend ostream &operator<<(ostream &cout, const Person &p);
private:
    int age;
    int age1;
    string n="df";
    string &name=n;
public:
    //无参构造
    Person(){cout<<"Person无参构造"<<endl;}
    //有参构造
    Person(int age,int age1,string &name):age(age),age1(age1),name(name)
    {
        cout<<"Person有参构造"<<endl;
    }
    //析构函数
    ~Person()
    {
        cout << "Person::析构函数" << endl;
    }
    //拷贝构造函数
    Person(const Person &other):age(other.age),age1(other.age1),name(other.name)
    {
         cout << "Person::拷贝构造函数" << endl;
    }
    //拷贝赋值函数
    Person &operator=(const Person &other)
    {
        if(this != &other) //避免自己赋值给自己
        {
            age = other.age; //深拷贝
            age1=other.age1;
            name=other.name;
        }
        cout << "拷贝赋值函数" << endl;
        return *this;
    }
    //输出
    void show()
    {
        cout<<"age="<<age<<"  age1="<<age1<<"    name="<<name<<endl;

    }

    void show1()
    {
        cout<<"age="<<age<<"  age1="<<age1<<endl;
    }
    //Person的运算符重载
    //算术运算符
    //成员函数实现+号运算符重载
    const Person operator+(const Person &R) const
    {
        Person temp;
        temp.age = this->age + R.age;
        temp.age1= this->age1 + R.age1;
        return temp;
    }
//局部函数实现>号运算符重载
    bool operator>( const Person &R)const
    {
        if(age > R.age  && age1 > R.age1)
        {
            return true;
        }
        else
        {
            return false;
        }
    }



};
//==========================================

class Stu
{
private:
    double *score;
public:
    //无参构造
    Stu(){cout<<"Stu无参构造"<<endl;}
    //有参构造
    Stu(double score):score(new double(score))
    {
        cout<<"Stu有参构造"<<endl;
    }
    //析构函数
    ~Stu()
    {
        cout << "Stu::析构函数" << endl;
        delete score;
    }
    //拷贝构造函数
    Stu(const Stu &other):score(new double(*(other.score)))
    {
         cout << "Stu::拷贝构造函数" << endl;
    }
    //拷贝赋值函数
    Stu &operator=(const Stu &other)
    {
        if(this != &other) //避免自己赋值给自己
        {
            score = new double(*(other.score)); //深拷贝
        }
        cout << "拷贝赋值函数" << endl;
        return *this;
    }
    void show()
    {
        cout<<"score="<<*score<<endl;
    }
};
#endif // STUPER_H

//函数体
#include "stuper.h"


    //全局函数实现前置++运算符重载
    const Person operator++(Person &O,int)
    {
        Person temp;
        temp.age=O.age++;
        temp.age1=O.age1++;
        return temp;
    }

    //全局函数实现插入<<运算符重载
    ostream &operator<<(ostream &cout, const Person &p)
    {
        cout << "age = " << p.age << " age1 = " << p.age1<<"name = "<<p.name;
        return cout;
    }

    //全局函数实现提取>>运算符重载
    istream &operator>>(istream &cin, Person &p)
    {
        cin >> p.age >> p.age1>>p.name;
        return cin;
    }