【c++】用c++实现Date类

╰半夏微凉° 2022-08-18 01:48 112阅读 0赞

#include<iostream>
    #include<assert.h>
    using namespace std;
    
    class Date
    {
    public:
    	Date(int year = 1900, int month = 1, int day = 1)
    		:_year(year),_month(month),_day(day)
    	{
    	    assert(year >= 1900);
    		assert(month > 0 && month < 13);
    		assert(day > 0 && day <= GetMonDay(year, month));
    	}
    	//赋值运算符重载
    	Date& operator=(const Date& d)
    	{
    	 if(*this != d)
    	 {
    	  _year = d._year;
    	  _month = d._month;
    	  _day = d._day;
    	 }
    	 return *this;
    	}
    	//计算一个日期加减一个天数的运算符重载
    	Date operator+(int day)
    	{ 
    	  Date tmp(*this); 
    	  if(day<0)
    	  {
    	   day = -day;
    	   return (tmp - day);
    	  }
    	  if(day == 0)
    	  {
    	   return tmp;
    	  }
    	  else
    	    tmp._day += day;
    	    if(tmp._day > GetMonDay(tmp._year,tmp._month))
    		{
    	       tmp._day -= GetMonDay(tmp._year,tmp._month);
               if(tmp._month == 12)
    		   {
    		      tmp._year++;
    		      tmp._month = 1;
    		   }
    		   else
    		   {
    		     tmp._month++;
    		   }
    		}
    	 return tmp;
    	}
    	Date operator+=(int day)
    	{
    	  Date tmp(*this);
    	  tmp = *this + day;
    	  *this = tmp;
    	  return *this;
    	}
    	Date operator-(int day)
    	{ 
    	  Date tmp(*this);
    	  if(day<0)
    	  {
    	     day = -day;
    		 return(tmp + day);
    	  }
    	  if(day == 0)
    	  {
    	     return tmp;
    	  }
    	  else
    		  tmp._day -= day;
    	      while(tmp._day<=0)
    		  {
    		   if(tmp._month == 1)
    		   {
    		    tmp._year--;
                tmp._month = 12;
    		   }
    		   else
    		   {
    		    tmp._month--;
    		   }
    		   tmp._day = GetMonDay(tmp._year,tmp._month)+tmp._day;
    		  }
    	  return tmp;
    	}
    	Date operator-=(int day)
    	{
    	 Date tmp(*this);
    	 tmp = *this - day;
    	 *this = tmp;
    	 return *this;
    	}
        Date operator++()
    	{
    	 *this += 1;
    	 return *this;
    	}
    	Date operator++(int)//后置++
    	{
    	 Date tmp(*this);
    	 *this += 1;
    	 return tmp;
    	}
    	Date operator--()
    	{
    	 *this -= 1;
    	 return *this;
    	}
    	Date operator--(int)//后置--
    	{
    	 Date tmp(*this);
    	 *this -= 1;
    	 return tmp;
    	}
    	//比较运算符的重载
    	bool operator==(const Date& d)
    	{
    	 return (_year == d._year && _month == d._month && _day == d._day);
    	}
    	bool operator!=(const Date &d)
    	{
    	 return !(*this == d);
    	}
    	bool operator >(const Date& d)
    	{
    	 if(_year > d._year)
    	 {
    	    return true;
    	 }
    	 if(_year == d._year)
    	 {
    	    if(_month > d._month)
    		{
    			 return true;
    		}
    		if(_month == d._month)
    		{
    			if(_day > d._day)
    			{
    		    return true;
    			}
    		}
    	 }
        return false;
    	}
    	bool operator>=(const Date& d)
    	{
    	 return (*this > d || *this == d);
    	}
    	bool operator <(const Date& d)
    	{
    	 return !(*this >= d);
    	}
    	bool operator<=(const Date& d)
    	{
    	 return !(*this>d);
    	}
    	int GetMonDay(int year, int month)
    	{
    	    assert(year >= 1900);
    		assert(month > 0 && month < 13);
    		static int monthArray[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    		int day = monthArray[month];
            if((month == 2) && (year%400 || (year%4 && year%100)))
    		{
    		    day+=1;
    		}
    		return day;
    	}
    	//计算两个日期相减
    	int operator-(const Date& d)
    	{
    	 int count = 0;
    	 Date d1 = *this;
    	 Date d2 = d;
    	 if(*this > d)
    	 {
    	  d1 = d;
    	  d2 = *this;
    	 }
    	 while(d1!=d2)
    	 {
    	  d1+=1;
    	  count++;
    	 }
    	 return count;
    	}
    
    	void Display()
    	{
    	 cout<<_year<<"-"<<_month<<"-"<<_day<<endl;
    	}
    
    private:
    	int _year;
    	int _month;
    	int _day;
    };
    
    void Test()
    {
     Date d1(2015,12,1);
     Date d2(2015,12,23);
     int count;
     count = d2-d1;
     cout<<count<<endl;
     d2 = d1;
     d2.Display();
     //cout<<(d1==d2)<<endl;
     //cout<<(d1!=d2)<<endl;
     //cout<<(d1>d2)<<endl;
     //cout<<(d1>=d2)<<endl;
     //cout<<(d1<d2)<<endl;
     //cout<<(d1<=d2)<<endl;
    
    // d.Display();
    }
    int main()
    {
    
    Test();
    return 0;
    }