日期类——日期计算器

"date.h"

<strong><span style="font-size:18px;">#pragma once

class Date
{
public:
	Date(int year = 1990,int month = 1,int day = 1)
		:_year(year)
		,_month(month)
		,_day(day)
	{
		if (IsInvalidData() == false)
		{
			_year = 1990;
			_month = 1;
			_day = 1;
		}
	}
	Date(const Date& d)
	{
		this->_year = d._year;
		this->_month = d._month;
		this->_day = d._day;
	}

	Date& operator=(const Date& d)
	{
		if (this != &d)
		{
			this->_year = d._year;
			this->_month = d._month;
			this->_day = d._day;
		}
		return *this;
	}
	Date& operator+(const int day)
	{
		_day += day;

		while (_day > DayOfMonth())
		{
			_month++;
			if (_month > 12)
			{
				_year++;
				_month = 1;
			}
			_day = _day - DayOfMonth();
		}
		return *this;
	}
	Date& operator-(const int day)
	{
		_day -= day;
		while(_day < 1)
		{
			_month--;
			if (_month < 1)
			{
				_year--;
				_month = 12;
			}
			_day = DayOfMonth() - (-_day);
		}
		return *this;
	}
	Date& operator++()//前置++
	{
		_day++;
		if (_day > DayOfMonth())
		{
			_month++;
			if (_month > 12)
			{
				_year++;
				_month = 1;
			}
			_day = 1;
		}
		return *this;
	}
	Date operator++(int)//后置++
	{
		Date tmp = *this;
		_day++;
		if (_day > DayOfMonth())
		{
			_month++;
			if (_month > 12)
			{
				_year++;
				_month = 1;
			}
			_day = 1;
		}
		return tmp;
	}
	Date& operator--()//前置--
	{
		_day--;
		if (_day < 1)
		{
			_month--;
			if (_month < 1)
			{
				_year--;
				_month = 12;
			}
			_day = DayOfMonth();
		}
		return *this;
	}
	Date operator--(int)//后置--
	{
		Date tmp = *this;
		_day--;
		if (_day < 1)
		{
			_month--;
			if (_month < 1)
			{
				_year--;
				_month = 12;
			}
			_day = DayOfMonth();
		}
		return tmp;
	}
	int operator-(const Date& d)
	{
		if (this > &d)
		{
			Date tmp = d;
			int count = 0;
			while (tmp != *this)
			{
				++tmp;
				++count;
			}
			return count;
		}
		else
		{
			Date tmp = *this;
			int count = 0;
			while(tmp != d)
			{
				++tmp;
				count++;
			}
			return count;
		}
	}
	bool operator==(const Date& d)
	{
		return (_year==d._year) && (_month == d._month) && (_day == d._day);
	}
	bool operator!=(const Date& d)
	{
		return !(operator==(d));
	}
	bool operator>(const Date& d)
	{
		return (_year > d._year)
			|| (_year == d._year && _month > d._month)
			|| (_year == d._year && _month > d._month && _day > d._day);
	}
	bool operator<(const Date& d)
	{
		return !(operator>(d));
	}
	void Display()
	{
		cout<<this->_year<<"_"<<this->_month<<"_"<<this->_day<<endl;
	}
protected:
	bool IsInvalidData()
	{
		if (_year < 1990 || _month < 1 || _month > 12 || _day < 1 || _day > DayOfMonth())
		{
			return false;
		} 
		else
		{
			return true;
		}
	}
	int DayOfMonth()
	{
		int arr[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
		if (IsLeepYear(_year) == true)
		{
			arr[2] = 29;
		}
		return arr[_month];
	}
	bool IsLeepYear(int year)
	{
		if (((year % 4 == 0)&&(year % 100 == 0)) || (year % 400 == 0))
		{
			return true;
		}
		else
		{
			return false;
		}
	}
private:
	int _year;
	int _month;
	int _day;
};</span></strong>


 

"test.cpp"

<strong><span style="font-size:18px;">#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
using namespace std;
#include "date.h"

void Test1()//operator=  operator+
{
	Date d(2016,7,8);
	d.Display();
	Date d1;
	d1.Display();
	d1 = d;//operator=
	d1.Display();
	//d = d + 10;  //operator+
	//d.Display();
	d = d + 100;  //operator+
	d.Display();
}

void Test2()//operator-  operator++
{
	Date d(2016,7,8);
	d.Display();
	//d = d-10; // operator-
	//d.Display();
	d = d-100; // operator-
	d.Display();
	++d;//operator++
	d.Display();
	++d;//operator++
	d.Display();

	Date d1(2012,12,31);
	d1.Display();
	++d1;//operator++
	d1.Display();
}

void Test3()//operator--
{
	Date d(2016,7,11);
	d.Display();
	--d;//operator--
	d.Display();
	Date d1(2000,1,1);
	d1.Display();
	--d1;
	d1.Display();
}

void Test4()//operator==  operator!=  operator>   operator<
{
	Date d(2001,1,1);
	Date d1(2001,2,1);
	Date d2(2001,1,1);
	cout<<(d==d2)<<endl;//operator==
	cout<<(d==d1)<<endl;//operator==
	cout<<(d!=d2)<<endl;//operator!=
	cout<<(d!=d1)<<endl;//operator!=
	cout<<(d>d1)<<endl;//operator>
	cout<<(d1>d2)<<endl;//operator>
	cout<<(d<d1)<<endl;//operator<
	cout<<(d1<d2)<<endl;//operator<
}

void Test5()//operator-
{
	Date d(2016,7,11);
	Date d1(2014,8,18);
	int ret = d-d1;
	cout<<ret<<endl;
	int tmp = d1-d;
	cout<<tmp<<endl;
}
int main()
{
	//Test1();
	//Test2();
	//Test3();
	//Test4();
	Test5();
	system("pause");
	return 0;
}</span></strong>


 

c++ class
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