text: // Exercise 13.12 Solution: Date.h
  // Date class definition.
  #ifndef DATE_H
  #define DATE_H
  
  #include <iostream>
  using namespace std;
  
  class Date
  {
     friend ostream &operator<<( ostream &, const Date & );
  public:
     Date( int m = 1, int d = 1, int y = 1900 ); // default constructor
     void setDate( int, int, int ); // set month, day, year
     Date &operator++(); // prefix increment operator
     Date operator++( int ); // postfix increment operator
     const Date &operator+=( int ); // add days, modify object
     bool leapYear( int ) const; // is date in a leap year?
     bool endOfMonth( int ) const; // is date at the end of month?
     int getMonth() const; // return the month of the date
  private:
     int month;
     int day;
     int year;
  
     static const int days[]; // array of days per month
     void helpIncrement(); // utility function for incrementing date
  }; // end class Date
  
  #endif
  
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