关系运算符重载

类的声明

// // Created by Rdw on 2017/3/9. // #ifndef PROJECT5_TIME_H #define PROJECT5_TIME_H class Time { private: int hour; int minute; public: Time();//默认构造函数 Time(int h , int m);//构造函数 ~Time();//析构函数 void show() const; void reset(int h , int m); /*重载关系运算符*/ friend bool operator==(const Time &object1 , const Time &object2); friend bool operator!=(const Time &object1 , const Time &object2); friend bool operator<(const Time &object1 , const Time &object2); }; #endif //PROJECT5_TIME_H

类的定义

// // Created by Rdw on 2017/3/9. // #include "Time.h" #include <iostream> using namespace std; Time::Time() { } Time::Time(int h, int m) { hour = h; minute = m; } Time::~Time() { } void Time::reset(int h, int m) { hour = h; minute = m; } void Time::show() const { cout << hour << "hours " << minute << "minutes" << endl; } bool operator==(const Time &object1, const Time &object2) { return (object1.hour == object2.hour && object1.minute == object2.minute); } bool operator!=(const Time &object1, const Time &object2) { return !(object1 == object2); } bool operator<(const Time &object1, const Time &object2) { int temp1 = object1.hour * 60 + object1.minute; int temp2 = object2.hour * 60 + object2.minute; return temp1 < temp2; }

类的使用

#include <iostream> #include "Time.h" using namespace std; int main() { Time time11 = Time(9 , 30); Time time12 = Time(10 , 30); Time time13 = Time(9 , 30); if (time11 == time12) cout << "OK!!!" << endl; else cout << "NOT OK!!!" << endl; if (time11 < time12) cout << "<" << endl; else cout << ">" << endl; }

测试结果

E:\Project5\cmake-build-debug\Project5.exe NOT OK!!! < Process finished with exit code 0