實現 日期 的運算---C++

實現 日期 的運算---C++

#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<assert.h>
using namespace std;
class Date
{
public:
	void display()
	{
		cout << _year << "-" << _month << "-" << _day << endl;
	}
	bool IsLeapyear(int year)
	{
		return ((year / 400 == 0) || (year / 4 == 0 && year / 100 != 0));
	}
	int GetMonthDay(int year, int month)
	{
		if (month > 12 || month < 1)
		{
			printf("無此月\n");
			return -1;
		}
		else
		{
			int dayarr[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
			if (IsLeapyear(year) && month == 2)
			{
				return 29;
			}
			else
			{
				return dayarr[month - 1];
			}
		}
	}
	Date& operator+(const int day)
	{
		if (day < 0)
		{
			return *this - (-day);
		}
		else
		{
			_day += day;
			while (_day > GetMonthDay(_year, _month))
			{
				_day -= GetMonthDay(_year, _month);
				if (_month == 12)
				{
					_year += 1;
					_month = 1;
				}
				else
				{
					_month += 1;
				}
			}
		}
		return *this;
	}
	Date& operator-(int day)
	{
		if (day < 0)
		{
			return *this + (-day);
		}
		else
		{
			_day -= day;
			while (_day <= 0)//注意   等於    的時候
			{
				if (_month == 1)
				{
					_year -= 1;
					_month = 12;
				}
				else
				{
					_month -= 1;
				}
				_day += GetMonthDay(_year, _month);
			}
		}
		return *this;
	}
	Date operator++(int day)//後置加加
	{
		Date tem = *this;
		*this = *this + 1;
		return tem;
	}
	Date& operator++()//前置加加
	{
		*this = *this + 1;
		return *this;
	}
	Date& operator--(int day)//後置減減
	{
		Date tem = *this;
		*this = *this - 1;
		return tem;
	}
	Date& operator--()//前置減減
	{
		*this = *this - 1;
		return *this;
	}
	Date& operator+=(const int day)
	{
		*this = *this + day;
		return *this;
	}
	Date& operator-=(const int day)
	{
		*this = *this - day;
		return *this;
	}
	bool operator>(const Date& cur)
	{
		if (_year > cur._year)
		{
			return 1;
		}
		else if (_year == cur._year)
		{
			if (_month > cur._month)
			{
				return 1;
			}
			else if (_month == cur._month)
			{
				if (_day > cur._day)
				{
					return 1;
				}
			}
		}
		return 0;
	}
	bool operator==(const Date& cur)
	{
		if (_year == cur._year
			&& _month == cur._month
			&& _day == cur._day)
		{
			return 1;
		}
		else
		{
			return 0;
		}
	}
	bool operator<(const Date& cur)
	{
		if (!(*this > cur || *this == cur))
		{
			return 1;
		}
		else
		{
			return 0;
		}
	}
	bool operator>=(const Date& cur)
	{
		if (*this > cur || *this == cur)
		{
			return 1;
		}
		else
		{
			return 0;
		}
	}
	bool operator<=(const Date& cur)
	{
		if (*this < cur || *this == cur)
		{
			return 1;
		}
		else
		{
			return 0;
		}
	}
	int operator-(const Date& cur)
	{
		int count = 0;
		Date max;
		Date min;
		if (*this > cur)
		{
			max = *this;
			min = cur;
		}
		else if (*this < cur)
		{
			max = cur;
			min = *this;
		}
		else
		{
			return 0;
		}
		while (1)
		{
			
			if (min == max)
			{
				return count;
			}
			else
			{
				min = min + 1;
				count++;
			}
		}
	}
public:
	Date(int year = 1990, int month = 1, int day = 1)
		:_year(year)
		, _month(month)
		, _day(day)
	{}
	Date(const Date& a)
		:_year(a._year)
		,_month(a._month)
		, _day(a._day)
	{}
	~Date()
	{}
	Date& operator=(const Date& cur)
	{
		_year = cur._year;
		_month = cur._month;
		_day = cur._day;
		return *this;
	}
private:
	int _year;
	int _month;
	int _day;
};
//operator+ operator-
//operator++ operator--
//operator+= operator-=
void test1()
{
	Date cur(2015, 11, 11);
	//(cur + 18).display();
	//(cur + 19).display();
	//(cur + 20).display();
	//(cur + (-30)).display();
	//(cur - 10).display();
	//(cur - 11).display();
	//(cur - 12).display();
	//(cur - (-18)).display();
}
//operator>  <  ==  >=  <=
void test2()
{
	Date cur1(2015, 11, 13);
	Date cur2(2015, 11, 12);
	cout << (cur1 > cur2) << endl;
	cout << (cur1 == cur2) << endl;
}
//operator-(const Date& cur)
void test3()
{
	Date date1(2015, 11, 11);
	Date date2(2015, 11, 1);
	Date date3(2015, 11, 22);
	cout << date1 - date2 << endl;
	cout << date1 - date3 << endl;
}
int main()
{
	//test1();
	//test2();
	test3();
	system("pause");
	return 0;
}