运算符重载的应用：日期类

来源：互联网发布：c语言 property get 编辑：程序博客网时间：2024/06/05 20:02
#define _CRT_SECURE_NO_WARNINGS 1#include<iostream>using namespace std;class Date{public:        Date(int year = 1900, int month = 1, int day = 1)    {            if (year > 0 && (month > 0 && month < 13) &&                (day > 0 && day < Getcount(year, month)))            {                _year = year;                _month = month;                _day = day;            }            else                cout << "the day is illegal" << endl;    }        Date(const Date& d)            :_year(d._year)            , _month(d._month)            , _day(d._day)        {}    //合法性判断    bool leap_year(int year)    {        if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0))        {            return true;        }        else            return false;    }    int Getcount(int year,int month)    {        int arr[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };        if (leap_year(year) && (2 == month))        {            arr[month] += 1;        }        return arr[month];    }    bool operator> (const Date &d)    {        if ((_year > d._year) ||            ((_year = d._year) && (_month > d._month)) ||            ((_year = d._year) && (_month = d._month) && (_day > d._day)))        {            return true;        }        else            return false;    }    bool operator<(const Date &d)    {        if ((_year < d._year) ||            ((_year = d._year) && (_month < d._month))            || ((_year = d._year) && (_month = d._month) && (_day < d._day)))        {            return true;        }        else            false;    }    bool operator == (const Date &d)    {        return ((_day == d._day)            && (_month == d._month)            && (_year == d._year));    }    bool operator != (const Date &d)    {        return((_year != d._year)            && (_month != d._month)            && (_day != d._day));    }    friend ostream& operator<<(ostream &_cout, const Date& d);    Date& operator = (const Date& d)    {            if (this != &d)            {                _year = d._year;                _month = d._month;                _day = d._day;            }            return *this;    }    Date operator+(int days)    {        Date temp(*this);        if (days < 0)        {            days = -days;            return temp - days;        }        temp._day += days;        while (temp._day > Getcount(temp._year, temp._month))        {            temp._day -= Getcount(temp._year, temp._month);            if (temp._month == 12)            {                temp._year ++;                temp._month = 1;            }            else            {                temp._month++;            }        }        return temp;    }    Date operator-(int days)    {        Date temp(*this);        if (days < 0)        {            days = -days;            return temp + days;        }        temp._day -= days;        while (temp._day <= 0)        {            temp._day += Getcount(temp._year, temp._month);            if (temp._month == 1)            {                temp._year -= 1;                temp._month = 12;            }            else            temp._month--;        }        return temp;    }    int operator-(const Date& d)    {        Date maxdate(*this);        Date mindate(d);        if (maxdate < mindate)        {            maxdate = d;            mindate = *this;        }        int days = 0;        while (mindate != maxdate)        {            days++;        }        return days;    }    Date& operator--()//前置--    {        return (*this = *this - 1);    }    Date operator--(int)//后置--    {        Date temp = (*this);        _day -= 1;        return temp;    }    Date& operator++()//前置++    {        _day += 1;        return (*this);    }    Date operator++(int)//后置++    {            Date tmp = (*this);            _day += 1;            return tmp;    }    void display()    {        cout << _year << "-" << _month << "-" << _day << endl;    }private:    int _year;    int _month;    int _day;};ostream& operator<<(ostream  &_cout, const Date& d){    _cout << d._year << "-" << d._month << "-" << d._day << endl;    return _cout;}int main(){    /*Date d;    system("pause\n");*/    Date d(2017, 3, 15);    d =d + 20;    d.display();    system("pause\n");    return 0;}
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