#ifndef DATEH
#define DATEH
#include <iostream>
using namespace std;

class date {
	virtual void print(ostream& ost) const;
public:
	enum month_t {
		january = 1,
		february,
		march,
		april,
		may,
		june,
		july,
		august,
		september,
		october,
		november,
		december
	};

	static const int length[];   //no non-static data members

	date(int initial_month, int initial_day, int initial_year);
	virtual ~date() {}

	virtual date& operator++();
	virtual date& operator+=(int count);

	friend ostream& operator<<(ostream& ost, const date& d) {
		d.print(ost);
		return ost;
	}
};
#endif