《日期类》的模拟实现

目录

前言：

头文件类与函数的定义Date.h

实现函数的Date.cpp

测试Test.cpp

运行结果：

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前言：

我们在前面的两章初步学习认识了《类与对象》的概念，接下来我们将实现一个日期类，是我们的知识储备更加牢固。

头文件类与函数的定义Date.h

#pragma once
#define _CRT_SECURE_NO_WARNIGS 1
#include<iostream>
using namespace std;class Date
{
public:friend ostream& operator<<(ostream& out, const Date& d);int GetMonthDay(int _year, int _month){int day[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };if ((_year % 4 == 0) && (_year % 100 != 0) || (_year % 400 == 0)){day[2] = 29;}return day[_month];}Date(int year = 2000, int month = 1, int day = 1){if (month > 12 || day > GetMonthDay(year, month)){cout << "Setting error!!!" << endl;exit(-1);}_year = year;_month = month;_day = 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);Date& operator+=(int day);Date operator+(int day);Date& operator++();Date operator++(int);Date& operator-=(int day);Date operator-(int day);Date& operator--();Date operator--(int);int operator-(const Date& d);
private:int _year;int _month;int _day;
};

实现函数的Date.cpp

 

#include"Data.h"
bool Date::operator==(const Date& d)
{return (_year == d._year) && (_month == d._month) && (_day == d._day);
}
bool Date::operator!=(const Date& d)
{return !(*this == d);
}
bool Date::operator>(const Date& d)
{if (_year > d._year){return true;}else if (_year < d._year){return false;}if (_month > d._month){return true;}else if (_month < d._month){return false;}if (_day > d._day){return true;}return 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);
}Date& Date::operator+=(int day)
{_day += day;while (_day > GetMonthDay(_year, _month)){_day -= GetMonthDay(_year, _month);_month++;if (_month == 13){_month = 1;_year++;}}return *this;
}Date Date::operator+(int day)
{Date tmp = *this;tmp += day;return tmp;
}Date& Date::operator++()
{*this += 1;return *this;
}
Date Date::operator++(int)
{Date tmp = *this;*this += 1;return tmp;
}Date& Date::operator-=(int day)
{_day -= day;while (_day <= 0){_month--;if (_month == 0){_month = 12;_year--;}_day += GetMonthDay(_year, _month);}return *this;
}Date Date::operator-(int day)
{Date tmp = *this;tmp -= day;return tmp;
}Date& Date::operator--()
{*this -= 1;return *this;
}Date Date::operator--(int)
{Date tmp = *this;*this -= 1;return tmp;
}int Date::operator-(const Date& d)
{int flag = 1;Date max = *this;Date min = d;if (max < min){max = d;min = *this;flag = -1;}int count = 0;while (max != min){++min;++count;}return flag * count;
}ostream& operator<<(ostream& out, const Date& d)
{out << d._year << "年" << d._month << "月" << d._day << "号";return out;
}

测试Test.cpp

#include"Data.h"
int main()
{Date d1(2024, 3, 10);cout << d1 << endl;Date d2(2024, 6, 17);cout << d2 << endl;printf("相差天数：");cout << (d2 - d1) << endl;return 0;
}

运行结果：