#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("无此月\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 等于 的时候
{
if (_month == 1)
{
_year -= 1;
_month = 12;
}
else
{
_month -= 1;
}
_day += GetMonthDay(_year, _month);
}
}
return *this;
}
Date operator++(int day)//后置加加
{
Date tem = *this;
*this = *this + 1;
return tem;
}
Date& operator++()//前置加加
{
*this = *this + 1;
return *this;
}
Date& operator--(int day)//后置减减
{
Date tem = *this;
*this = *this - 1;
return tem;
}
Date& operator--()//前置减减
{
*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;
}
本文出自 “水仙花” 博客，请务必保留此出处http://10704527.blog.51cto.com/10694527/1719279
原文：http://10704527.blog.51cto.com/10694527/1719279