#ifndef CS101_CLASS_DATE
#define CS101_CLASS_DATE

#include <iostream>
using namespace std;

class Date {
   public:
      // default constructor: creates day of form month/day/year
      Date(int month = 9, int day = 14, int year = 1752);

      // inspector getMonth(): returns the month associated with the date
      int getMonth() const;

      // inspector getDay(): returns the day associated with the date
      int getDay() const;

      // inspector getYear(): returns the year associated with the date
      int getYear() const;

      // mutator setMonth(): sets the month associated with the date, if
	  // an invalid month is requested, an error message is generated and
	  // 1 is used.
      void setMonth(int month);

      // mutator setDay(): sets the day associated with the date, if
	  // an invalid day is requested, an error message is generated and
	  // 1 is used
	  void setDay(int day);

	  // mutator setYear(): sets the year associated with the date, if
	  // an invalid year is requested, an error message is generated and
	  // 2001 is used
      void setYear(int year);

	  // mutator extract(): sets the date using the representation extracted
	  // from input stream sin.  The representation has form month/day/year.
	  // If an invalid month, day, or year is supplied, an error message is
	  // generated and the date 1/1/2001 is used.
      void extract(istream &sin);

	  // operator ++: changes the representation of the invoking object to 
	  // the immediately successive date. The invoking object is returned.
      Date& operator ++ (void);

	  // operator ==: returns true if the source represents the date as the
	  // invoking object
      bool operator == (const Date& source) const;

      // facilitator insert(): displays a representation of the date to 
	  // stream sout.  The representation has form month/day/year.
      void insert(ostream &sout) const;
   private:

      int thisMonth;		// represents the month of our date
      int thisDay;			// represents the day of our date
      int thisYear;			// represents the year of our date
};

// auxiliary operators

// operator >>: extracts a date of form month/day/year from sin and assigns 
// it to target. The operator is supplied as a client courtesy, The operator
// makes use of date member function extract
istream& operator >> (istream &sin, Date &target);

// operator <<: inserts the date to sout with form month/day/year. The 
// operator is supplied as a client courtesy,  The operator makes use of 
// date member function insert
ostream& operator << (ostream &sout, const Date &source);

// operator +: returns the date that is nbrDays days after dateOfInterest,
// where nbrDays is at least 0
Date operator + (const Date &dateOfInterest, int nbrDays);

// isLeapYear(): returns true if y is a leap year; otherwise, returns
// false
bool isLeapYear(int y);

#endif