Assignment for object oriented programming.

                       Due Monday 3/19


  Object Oriented Programming (oop) is discussed in section 3.4 (and later)
in your text book.  In section 3.4 they *describe* a class called "date",
which represents a date using three variables: day, month, and year.  
Conceptually this class is very similar to our example of a time class with
minutes and seconds (see web page).  However, the book does not give the
full implementation of the class.  It only describes what methods (functions)
the class should contain (AssignDate, DisplayShort, DisplayVerbose, and 
NextDay).  

  For this assignment you are to first complete the following book exercises:

Page 134, # 1, 2, 6  (problem 3,4 are very helpful too, and have answers in
 the back of the book).

  Then, you are to complete the definition of the date class described
in the book.  That is, WRITE A PROGRAM that completes the
implementation of the class based on the description in the book.  That is,
define the four functions above in the public section of the class:

class date
{
private:
  int month;
  int day;
  int year;

public:
  date() {} 

// your code goes here

}; // end class date


Note that this class does not have a standard constructor function
like in the examples we've seen.  It only has what I've called an
"alternate" constructor (which I've included above).  This means that
you can not declare an object and pass to it initial values at the
same time.  You must first declare and object (such as in "date
mybirthday;") then use the AssignDate function to assign values to the
date.

Be sure to also write a main function (and remember to #include<iostream.h>)
to create at leat two objects of the class (like the ones in problem 1 and 2)
and demonstrate calling the various methods (functions).

Make sure you understand that this should be a real, working program.
Be sure that your code is well commented.  Before each function,
describe what it does and how it's to be called.