Classes

 Write a class for a Person. A Person should have a unique id, a name
 and a birthday. (You may use the Date class to help you.)

 Write a class called Shape. A shape should have a number of sides, a
 name, a perimeter and an area.



Constructors

  Write a constructor for your person class. Give the id a value of 1,
  the name "Unknown" and the birthday to 1/1/2016.

  Write a constructor for your Shape class. Default shapes have 0
  sides, "Circle" as a name, a perimeter of 6.28 and an area of 3.14.


Accessors/Mutators
  
   Write a setID and a getID function for your person class. Also,
   write an output function that outputs all the information about a
   specific person.

   Write an output function for all the data in your Shape. Also, give
   functions that allow a user to change the number of sides,
   perimeter and area.


Putting it all together.

 Provide a main that creates an array of Person.  Allow the user
    to change the IDs so they are unique. Output all the elements in
    the array.

 Provide a main that creates and uses several Shapes.