C++day04(类中特殊成员函数、匿名对象、友元、常成员函数和常对象、运算符重载)

1> 思维导图

2> 整理代码

代码：

算术运算符重载：

#include 

using namespace std;
class Person
{
    //全局函数实现运算符重载需要权限
    friend const Person operator+(const Person L,const Person R);
private:
    int a;
    int b;
public:
    Person() {}
    Person(int a,int b){
        this->a=a;
        this->b=b;
    }
    void show(){
        cout << "a=" << a <<"b=" << b<

关系运算符重载：

#include 

using namespace std;
class Person
{
    //全局函数实现运算符重载需要权限
    friend bool operator>(const Person L,const Person R);
private:
    int a;
    int b;
public:
    Person() {}
    Person(int a,int b){
        this->a=a;
        this->b=b;
    }
    void show(){
        cout << "a=" << a <<"b=" << b<(const Person p)const{
//        if(a>p.a && b>p.b){
//            return true;
//        }
//        return false;
//    }
    bool operator==(const Person p)const{
        if(a==p.a && b==p.b){
            return true;
        }
        return false;
    }
    bool operator<(const Person p)const{
        if(a=(const Person p)const{
        if(a>=p.a && b>=p.b){
            return true;
        }
        return false;
    }
    bool operator<=(const Person p)const{
        if(a<=p.a && b<=p.b){
            return true;
        }
        return false;
    }

};
//全局函数实现运算符重载
bool operator>(const Person L,const Person R){
    if(L.a>R.a && L.b>R.b)
    return true;
    return false;
}

int main()
{
    Person p1(10,10);
    Person p2(10,20);
    p1.show();
    p2.show();
    if(p2>p1){
        cout << "p2>p1" <=p1){
        cout << "p2>=p1" <

赋值运算符重载

#include 

using namespace std;
class Person
{
    //全局函数实现运算符重载需要权限
    friend Person &operator+=(Person &L,const Person &R);
private:
    int a;
    int b;
public:
    Person() {}
    Person(int a,int b){
        this->a=a;
        this->b=b;
    }
    void show(){
        cout << "a=" << a <<"b=" << b<