#ifndef DATE_H
#define DATE_H

/*
This is the header file for class date.
Jan  1, 0 AD is day   0
Jan  2, 0 AD is day   1
Dec 31, 0 AD is day 364
Jan  1, 1 AD is day 365
etc.
so  day / 365 is the year
and day % 365 is the day of the year (in the range 0 to 364 inclusive)
*/

#include <iostream>

class date {
	int day;
	static const int length[];
public:
	date(int m, int d, int y);
	date();   //Put today's date into the newborn object.

	//operator overloading (Feb 12)

	date& operator+=(int n) {day += n; return *this;}
	date& operator-=(int n) {day -= n; return *this;}

	explicit operator int() const {return day;}

	friend std::ostream& operator<<(std::ostream& os, const date& d);
	friend std::istream& operator>>(std::istream& is, date& d);

	friend int operator-(const date& a, const date& b);

	friend bool operator==(const date& a, const date& b);
	friend bool operator<(const date& a, const date& b);
};

inline const date operator+(date d, int n)
{
	d += n;
	return d;
}

inline const date operator+(int n, date d)
{
	d += n;
	return d;
}

inline const date operator-(date d, int n)
{
	d -= n;
	return d;
}

inline date& operator++(date& d)             //prefix
{
	return (d += 1);
}

inline const date operator++(date& d, int)   //postfix
{
	const date old {d};
	++d;
	return old;
}

inline date& operator--(date& d)             //prefix
{
	return (d -= 1);
}

inline const date operator--(date& d, int)   //postfix
{
	const date old {d};
	--d;
	return old;
}

inline bool operator!=(const date& a, const date& b)
{
	return !(a == b);
}

inline bool operator<=(const date& a, const date& b)
{
	return (a < b) || (a == b);
}

inline bool operator>(const date& a, const date& b)
{
	return b < a;
}

inline bool operator>=(const date& a, const date& b)
{
	return !(a < b);
}

#endif