Date.h
#pragma once
#include <iostream>
using namespace std;
class Date
{
public:
Date(int year, int month, int day);
/*Date(const Date& d);*/
Date& operator+=(const Date& d);
Date operator+(int day);//加上多少天,不改变初始日期的值
Date operator+=(int day);//加上多少天,改变初始日期的值
Date operator-(int day);//减去多少天,不改变初始日期的值
Date& operator-=(int day);//减去多少天,改变初始日期的值
int operator-(const Date& d);//两个日期相减相差多少天
Date operator++(); //data++
Date operator++(int);//++date
Date operator--();//date--
Date operator--(int);//--date
bool operator>(const Date& d);//比较日期大小
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);
int GetMonthDay(int year, int month);
void Print();
private:
int _year;
int _month;
int _day;
};
Date.cpp
#include "Date.h"
int Date::GetMonthDay(int year, int month)
{
static const int monthDay[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
if ((month == 2)&&(year % 4 == 0 && year % 100 != 0) || (year%400 == 0))
{
return 29;
}
return monthDay[month];
}
Date Date :: operator+(int day)
{
Date ret(*this);
ret += day;
return ret;
}
Date Date::operator+=(int day)
{
if (day < 0)
{
return *this -= (-day);
}
_day += day;
while (_day>GetMonthDay(_year,_month))
{
_day -= GetMonthDay(_year, _month);
_month++;
if (_month > 12)
{
_month = 1;
_year++;
}
}
}
Date Date :: operator-(int day)
{
Date ret(*this);
ret -= day;
return ret;
}
Date& Date :: operator-=(int day)
{
if (day < 0)
{
return *this += (-day);
}
_day -= day;
while (_day <= 0)
{
--_month;
if (_month == 0)
{
_year--;
_month = 12;
}
_day += GetMonthDay(_year, _month);
_month--;
}
return *this;
}
//++d
Date Date::operator++()
{
*this += 1;
return *this;
}
//d++
Date Date::operator++(int)
{
Date ret(*this);
*this += 1;
return ret;
}
//--d
Date Date::operator--()
{
*this -= 1;
return *this;
}
//d--
Date Date::operator--(int)
{
Date ret(*this);
*this -= 1;
return ret;
}
int Date::operator-(const Date& d)//两个日期相减相差多少天
{
Date max = *this;
Date min = d;
int flag = 1;
if (*this < d)
{
max = d;
min = *this;
flag = -1;
}
int n = 0;
while (min < max)
{
++min;
++n;
}
return n*flag;
}
Date::Date(int year=2018, int month=10, int day=27)
{
if (year >= 0
&& month > 0 && month<13
&& day>0 && day <= GetMonthDay(year, month))
{
_year = year;
_month = month;
_day = day;
}
else
{
cout << "Date invalid" << endl;
//assert(false);//终止程序
}
}
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)
{
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);
}
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);
}
void Date::Print()
{
cout << _year << "-" << _month << "-" << _day << endl;
}
Main.cpp
#include"Date.h"
int main()
{
Date d(2018,10,28);
Date d1 = d + 100;
d.Print();
d1.Print();
Date d2(2018, 5, 8);
d2 += 100;
d2.Print();
Date d3 = d2 - (-100);
d3.Print();
Date d4 = d3 + (-100);
d4.Print();
int k = d3 > d4;
cout << k << endl;
Date d5 = d4;
(d5++).Print();
(++d5).Print();
int a = d3 - d4;
cout << a << endl;
return 0;
}