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#pragma once#include iostream
#include assert.husing namespace …
上一篇文章只实现了operator操作符重载由于运算符较多该篇文章单独实现剩余所有的运算符重载。继续以Date类为例实现运算符重载 1.Date.h
#pragma once#include iostream
#include assert.husing namespace std;class Date
{
private:int _year;int _month;int _day;
public:void Print();Date(int yaer, int month, int day);bool operator(const Date d);bool operator(const Date d);bool operator(const Date d);bool operator(const Date d);bool operator(const Date d);bool operator!(const Date d);//单独的用一个函数把每个月多少天封装起来int GetMonthDays(int year, int month){assert(month 0 month 13);static int MonthDay[13] { 0,31,28,31,30,31,30,31,31,30,31,30,31 };if (month2(year % 4 0 year % 100 ! 0)){return 29;}return MonthDay[month];}Date operator(int day);Date operator(int day);Date operator-(int day);Date operator-(int day);//d前置Date operator();//d后置Date operator(int);//前置--Date operator--();//后置--Date operator--(int);//两个日期相减d1-d2int operator-(const Date d);
};Date.cpp
#define _CRT_SECURE_NO_WARNINGS 1
#include stdio.h#include Date.hvoid Date::Print()
{cout _year / _month / _day endl;
}Date::Date(int year1, int month1, int day1)
{_year year;_month month;_day day;
}
// 写好一个直接复用
bool Date::operator(const Date d)
{if (_year d._year){return true;}else if (_year d._year){if (_month d._month)return true;else if ((_month d._month) (_day d._day))return true;elsereturn false;}elsereturn false;
}bool Date::operator(const Date d)
{if ((_year d._year) (_month d._month) (_day d._day))return true;elsereturn false;
}bool Date::operator(const Date d)
{return *this d || *this d;
}bool Date::operator(const Date d)
{return !(*this d);
}bool Date::operator(const Date d)
{return (*this d || *this d);
}bool Date::operator!(const Date d)
{return !(*this d);
}Date Date::operator(int day)
{_day day;//先加//这里是while,因为如果是if的话如果一次加了很大的数据减一次不一定能减得完!!!while(_day GetMonthDays(_year, _month)){_day - GetMonthDays(_year, _month);_month;if (_month 13){_year;_month 1;}}return *this;
}Date Date::operator(int day)
{Date tmp*this;tmp day;return tmp;
}Date Date::operator-(int day)
{_day - day;while (_day 0){--_month;if (_month 0){--_year;_month 12;}_day GetMonthDays(_year, _month);}return *this;
}Date Date::operator-(int day)
{Date tmp *this;tmp - day;return tmp;
}Date Date::operator()
{return *this 1;
}Date Date::operator(int)
{Date tmp *this;*this 1;return tmp;
}Date Date::operator--()
{*this - 1;return *this;
}Date Date::operator--(int)
{Date tmp *this;*this - 1;return tmp;
}
//日期-日期计算两个日期之间相差多少天int Date::operator-(const Date d)
{int flag 1;Date max *this;Date min d;if (*this d){//赋值为-1的原因因为这个函数是有顺序的d1-d2如果遇到d1d2也就是小减大最终返回的结果是个负数所以说这里要变成-1。flag -1;max d;min *this;}//定义一个变量int n 0;// 用循环算两个日期中间的差值while (min ! max){min;n;}return n * flag;
}
3.Test.cpp
#define _CRT_SECURE_NO_WARNINGS 1
#include stdio.h
#include Date.hint main()
{Date d1(2024, 2, 15);Date d2 d1 20;d1.Print();d2.Print();bool retd1 d2;if (ret){d1.Print();}d2 100;d2.Print();d2 - 100;d2.Print();Date d3 d2 - 10;d3.Print();Date d4(2024, 1, 29);Date d5(2024, 8, 1);cout d5 - d4 endl;d5;d5.Print();d5;d5.Print();--d5;d5.Print();d5--;d5.Print();return 0;
}
