c++日期类的实现

//功能实现的不是很完全，也借鉴了网上的巧妙方法，如确定每个月的天数用数组直接解决。

//类的定义以及各种操作符的声明。

Date.h

#include<iostream>

};

//具体的操作的实现

#include"Date.h"Date::Date(){}//构造函数Date::Date(int year = 2000, int month = 1, int day = 1):_year(year), _month(month), _day(day){if ((year<0) ||(month>13&&month<=0) ||(day<=0) && (day>Getdaysinmonth(year, month))){cout << "输入不合法，请重新输入：" << endl;//cin >> "year:" >> year >> "month:" >> month >> "day:" >> day >> endl;}}//判断每个月的天数合法性int Date::Getdaysinmonth(int year, int month){int days[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };if ((((0 == year % 4) && (0 != year % 100)) || (0 == year % 400)) && (month == 2)){days[month] = 29;}return days[month];}//日期合法化Date Date:: ToCurrect(Date& d){if (d._day > Getdaysinmonth(d._year, d._month)){while (d._day > Getdaysinmonth(d._year, d._month)){d._day -= Getdaysinmonth(d._year, d._month);if (d._month == 12){d._year++;d._month = 1;}else{++d._month;}}}else {while (d._day <= 0){if (d._month == 1){d._year--;d._month = 12;}else{--d._month;}d._day += Getdaysinmonth(d._year, d._month);}}return d;}//拷贝构造函数Date::Date(const Date& d){_year = d._year;_month = d._month;_day = d._day;}//赋值运算符的重载Date& Date::operator=(const Date& d){if (this != &d){_year = d._year;_month = d._month;_day = d._day;}return *this;}//析构函数Date::~Date(){//cout << "已被析构" << endl;}//减去任意一个天数Date Date::operator-(int days){if (days < 0){days = 0 - days;}Date temp(*this);temp._day -= days;while (temp._day < 0){if (temp._month == 1){temp._month = 12;temp._day += 31;temp._year -= 1;}else{--temp._month; temp._day += Getdaysinmonth(_year, temp._month);}}return temp;}//两个天数相减int Date::operator-(const Date& d){Date mindate=*this;Date maxdate=d;int count = 0;if (mindate > maxdate){std::swap(mindate, maxdate);}while (mindate != maxdate){++mindate;count++;}return count;}//加上任意一个天数Date Date::operator+(int days){if (days < 0){days = 0 - days;}else{Date temp(*this);temp._day += days;while (temp._day >Getdaysinmonth(temp._month,temp._day)){if (temp._month == 12){temp._month = 1;temp._day += 1;temp._year += 1;}else{++temp._month;temp._day -= Getdaysinmonth(_year, temp._month);}}return temp;}}//天数的前置++Date& Date::operator++(){++_day;ToCurrect(*this);return *this;}//天数的后置++Date Date::operator++(int){Date temp(*this);temp._day = temp._day + 1;ToCurrect(*this);return temp;}//天数的前置--Date& Date::operator--(){--_day;ToCurrect(*this);return *this;}//天数的后置--Date Date::operator--(int){Date temp(*this);temp._day = temp._day -1;ToCurrect(*this);return temp;}//各种日期见比较的操作符重载bool Date:: operator>(const Date& d){return ((_year > d._year) || ((_year == d._year) && (_month > d._month)) || ((_year == d._year) && (_month == d._month) && (_day > d._day)));}bool Date:: operator<(const Date& d){return ((_year < d._year) || ((_year == d._year) && (_month < d._month)) || ((_year == d._year) && (_month == d._month) && (_day < d._day)));}bool Date::operator==(const Date& d){return ((_year == d._year) && (_month == d._month) && (_day == d._day));}bool Date::operator<=(const Date& d){return ((_year <= d._year) && (_month <= d._month) && (_day <= d._day));}bool Date::operator>=(const Date& d){return ((_year >= d._year) && (_month >= d._month) && (_day >= d._day));}bool Date::operator!=(const Date& d){return !(operator==(d));//return((_year != d._year) && (_month != d._month) && (_day != d._day));}ostream& operator<<(ostream& _cout, const Date& d){_cout << d._year << "-" << d._month << "-" << d._day;return _cout;}istream& operator>>(istream& _cin, Date& d){_cin >> d._year >> d._month >> d._day;return _cin;}void test1(){Date d1(2017,1,4);Date d2(2016,1,1);Date d3(d1);Date d4(d1);int count1 = 0;count1 = d1 - d2;cout << "两个日期相减为：" << count1 << endl;d4 = d1 - num;cout << "加上num天后为：" << d4 << endl;d3 = d1 + num;cout << "减去num天后为：" << d3 << endl;}int main(){test1();}