用C/C++实现一个日期类，重载运算符=，==，+，-，++，--，>，>=，<，<=等

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#include<iostream>#include<windows.h>using namespace std;class Date{public:Date(int year, int month, int day) //构造函数:_year(year),_month(month),_day(day){}Date(Date & d)   //拷贝构造:_year(d._year), _month(d._month), _day(d._day){}Date & operator = (const Date &d) //赋值运算符的重载{//将实例d的所有成员变量值全部赋值给this,这里不存在指针问题，就不用考虑内存问题_year = d._year;_month = d._month;_day = d._day;return *this;}bool operator == (const Date& d)//重载 =={return this->_year == d._year&& this->_month == d._month&& this->_day == d._day;}bool operator <(const Date& d) //重载 <{if (_year < d._year)//判断年{return true;}else if (_year == d._year)//年相等，就判断月{if (_month<d._month){return true;}else if (_month == d._month)//月相等，判断天{if (_day<d._day){return true;}}}return false;}bool operator <=(const Date& d)//重载<=(复用函数<和==){return (*this<d) || (*this == d);//当<或==满足一个的时候为真}bool operator >(const Date& d)//重载<=(复用函数<=){return !(*this <= d);}bool operator >=(const Date& d){return !(*this < d);}Date operator+ (int day)//重载+{int ret = GetMonthDay(_year, _month);//调用函数获取当年当月天数Date tmp = *this;//用this创建一个临时对象while ((_day + day) > ret)//循环条件：当总天数大于一个月的天数时{if ((tmp._month + 1) > 12)//当月份大于12时{tmp._year++;//年份加一tmp._month = 0;//月份置零}else//否则，月份加一{tmp._month++;}day -= ret;//总天数减去当月的天数ret = GetMonthDay(_year, tmp._month);//获取下一月的天数}tmp._day += day;return tmp;}Date& operator+= (int day)//重载+=（复用+）{*this = *this + day;return *this;}Date operator- (int day)//重载-{int ret = GetMonthDay(_year, _month);Date tmp = *this;while (day > tmp._day)//当需要减的天>当月的天数时进行循环{while (day > ret){if (tmp._month > 1){tmp._month--;}else{tmp._year--;tmp._month = 11;}day -= ret;ret = GetMonthDay(tmp._year, tmp._month);}day -= ret;}tmp._day -= day;return tmp;}Date& operator-= (int day)//重载-=（复用-）{*this = *this - day;return *this;}Date operator++(){return *this += 1;}Date operator++(int){return *this + 1;}Date operator--(){return *this -= 1;}Date operator--(int){return *this - 1;}int operator-(const Date& d)//日期间日期{Date tmp = *this;int day = 0;int ret = 0;if (tmp > d){while (tmp._year > d._year){if (tmp._month > 2){if (IsLeapYear(tmp._year)){day += 366;tmp._year--;}}else{day += 365;tmp._year--;}}while (tmp._month > d._month){ret = GetMonthDay(tmp._year, tmp._month);day += ret;}if (tmp._day > d._day){day += tmp._day - d._day;}else{day -= d._day - tmp._day;}}return day;}void Display(){cout << _year << "\t" << _month << "\t" << _day << endl;}protected:bool IsLeapYear(int year)//判断是否为闰年{if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0){return true;}return false;}int GetMonthDay(int year, int month)//获得当年当月天数{int monthArray[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };int day = monthArray[month];if (month == 2 && IsLeapYear(year)){day += 1;}return day;}private:int _year;int _month;int _day;};
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