日期类

来源：互联网发布：wear it on 编辑：程序博客网时间：2024/05/22 22:35
功能实现：在一个日期上+N天、-N天，重载前置++/--和后置++/--以及两个日期之间的差距，还有就是比较两个日期之间的大小。
#include<iostream>using namespace std;class Date{           friend ostream & operator<<(ostream& os, Date& d)//输出运算符重载          {                   os << d._year << "-" << d._month << "-" << d._day;                    return os;          }public:          Date( int year = 1900, int month = 1, int day = 1)//构造函数                   :_year( year)                   ,_month( month)                   ,_day( day)          {                    if (Invalid())                   {                             _year = 1900;                             _month = 1;                             _day = 1;                   }          }           //检查日期是否不合法           bool Invalid()          {                    if (_year < 1900 || _month<1 || _month>12 || _day<0 || _day>GetMonthDay(_month))                   {                              return true ;                   }                    return false ;          }           //获取每月的天数           int GetMonthDay(int month)          {                    int date[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };                    if (IsLeap())                   {                             date[2]+= 1;                   }                    return date[month ];          }           //判断是否是闰年           bool IsLeap()          {                    if ((_year % 400 == 0) || ((_year % 4 == 0) && (_year % 100 != 0)))                   {                              return true ;                   }                    else                              return false ;          }          Date( Date & d )//拷贝构造          {                   _year = d._year;                   _month = d._month;                   _day = d._day;          }           //修正日期           void ToCorrect(Date & temp)          {                    while (temp ._day <= 0)                   {                              if (temp ._month == 1)                             {                                       temp._month = 12;                                       temp._year--;                             }                              else                             {                                       temp._month -= 1;                             }                              temp._day += GetMonthDay(temp ._month);                   }                    while (temp ._day > GetMonthDay(temp._month))                   {                              temp._day -= GetMonthDay(temp ._month);                              if (temp ._month == 12)                             {                                       temp._month = 1;                                       temp._year++;                             }                              else                             {                                       temp._month++;                             }                   }          }           //日期加天数           Date operator+(int day)          {                    Date temp(*this );                   temp._day += day;                   ToCorrect(temp);                    return temp;          }           //日期减天数           Date operator-(int day)          {                    Date temp(*this );                   temp._day -= day;                   ToCorrect(temp);                    return temp;          }           //日期减日期           int  operator-(Date & d)          {                    Date min(*this );                    Date max(d );                    if (min>max)                   {                             max = * this;                             min = d;                   }                    int count=0;                    while (min != max)                   {                             min++;                             count++;                   }                    return count;          }           bool operator>(Date &d)          {                    if (_year > d ._year)                   {                              return true ;                   }                    else if ((_year = d._year) && (_month > d._month))              {                              return true ;                   }                    else if ((_year =d. _year) && (_month = d._month) && (_day > d._day))                   {                              return true ;                   }                    return false ;          }           bool operator==(Date & d)          {                    return _year == d ._year&&_month == d._month&&_day == d._day;          }           bool operator<(Date &d)          {                    return !(*this >d && * this == d );          }           bool operator!=(Date & d)          {                    return !(*this == d);          }           Date& operator=(Date & d)//赋值          {                   _year = d._year;                   _month = d._month;                   _day = d._day;                    return *this ;          }           Date& operator+(Date & d)//加法          {                   _year += d._day;                   _month += d._month;                   _day += d._day;                    return *this ;          }           Date& operator++()//前置++          {                   * this=*this +1;                    return *this ;          }           Date operator++(int )//后置++          {                    Date temp(*this );                   * this = *this + 1;                    return temp;          }private:           int _year;           int _month;           int _day;};int main(){           Date d1(2016, 4, 6);          cout << d1 - 100 << endl;           Date d2(1994, 3, 24);          cout << d1 - d2 << endl;          getchar();           return 0;}
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