class Date    // Class Declaration  (Date.h)
{
private:      // Begin with private member variables
 int day;
 int month;     // Internal representation
 int year;      //   (hidden from class users)

public: // this is the public interface
       //   that users will use to create Date objects
 // Constructors
 Date();
 Date( int m, int d, int y );

 // Mutator functions -- change the object
 void setDay( int d );
 void setMonth( int m );
 void setYear( int y );
 void increment(); // add one day
 void decrement(); // subtract one day

 // Accessor functions (often defined using const)
 int getDay() const;
 int getMonth() const;  // <== const means member variables
 int getYear() const;   //      will not be changed

 bool isEqual( const Date &date2 ) const;    // same day, month, year?
//  bool isSameDayAndMonth( const Date& date2 ) const;

 bool isLeapYear() const;
 bool isLastDayInMonth() const;
 int lastDayInMonth() const;

 void print() const;

//  void add_days( int days );  // e.g. mutator functioN

 Date operator+ ( int days ) const;   // e.g. Date d2 = d1 + 40;
                                      //      Date d3 = d1 + 50 + 60;

 // postfix
//  void operator++ ( int dummy );
 Date operator++ ( int dummy );

 // prefix
 Date& operator++ ();

};

bool sameDayAndMonth( const Date &date1, const Date &date2 );

bool isLessThan( const Date& date1, const Date& date2 );

bool operator< ( const Date& date1, const Date& date2 );

ostream& operator<< ( ostream& os, const Date& d );

Date operator- ( const Date& d1, int days );

bool operator== ( const Date& d1, const Date& d2 );