实现Data类

运算符重载 + - = > <

主要功能

实现日期加日期 
实现日期间日起 
判断N天后是几月几号 
判断N天前是几月几号 
实现复制运算符重载

代码实现

class Date {
   public:     Date(int year = 1900, int month = 1, int day = 0)      /*构造函数*/         :_year(year)         ,_month(month)         ,_day(day)     {
           assert(JudgeDay());         cout<<"Date()"<
    
     _year >= date._year)         {
               int addYear = this->_year - date._year;             if (this->_month >= date._month)             {
                   Date newDate(date);                 int sum = 0;                 while (newDate._month != this->_month)                 {
                       sum += newDate.GetDay(newDate._year, newDate._month);                     newDate._month++;                 }                 return ( sum += addYear * 365 + this->_day - date._day );             }             else if (this->_month < date._month)             {
                   Date newDate(*this);                 int sum = 0;                 while (newDate._month != date._month)                 {
                       sum += newDate.GetDay(newDate._year, newDate._month);                     newDate._month++;                 }                 return ( sum = addYear*365 - sum + this->_day - date._day );             }         }     }     bool operator<(const Date& date)/*
     <运算符重载* { if (this->
      _year < date._year ||             (this->_year == date._year && this->_month < date._month) ||             (this->_month == date._month && this->_day < date._day)             )         {
               return true;         }         return false;     }     bool operator <=(const Date& date)/*'<'运算符重载*/     {
           if ( *this < date ||             (this->_year == date._year &&             this->_month == date._month&&             this->_day == date._day) )         {
               return true;         }         return false;     }     bool operator>(const Date& date)/*'>'运算符重载*/     {
           if ( this->_year > date._year||             (this->_year == date._year && this->_month > date._month) ||             (this->_month == date._month && this->_day > date._day) )         {
               return true;         }         return false;     }     bool operator >=(const Date& date) /*'>='运算符重载*/     {
           if (*this > date ||             (this->_year == date._year &&             this->_month == date._month &&             this->_day == date._day) )         {
               return true;         }         return false;     }     bool operator==(const Date& date)     {
           if (this->_year == date._year &&             this->_month == date._month &&             this->_day == date._day)         {
               return true;         }         return false;     }     bool operator!=(const Date& date)     {
           if ( this->_year != date._year ||             (this->_year == date._year &&             this->_month != date._month )||             (this->_month == date._month &&             this->_day != date._day) )         {
               return true;         }         return false;     }     ~Date()     {
           cout<<" ~Date()"<
     
    

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