1.   EAN Processor - Procedural Version
   • Sample Main
   • Test Main (use this main for unit testing)
2.   EAN Processor - Object Version
   • Sample Main
   • Test Main (use this main for unit testing)
3.  Order Processor
• Sample Main
• Test Main (use this main for unit testing)
4.  Order Processor with Special Orders
• Sample Main
• Test Main (use this main for unit testing)

                     Grading Policy for A3, A4 (Summer 2014)

1. You will receive 80% of the marks if your code works correctly with
   a3test.cpp and a3main.cpp and a4test.cpp and a4main.cpp.

2. You will receive 89% of the marks if you have created concise code structures 
   and excellent documentation.
   a) You should refactor redundant code into functions. (For example, the
      constructors should call a setter. A function is called to allocate memory
      dynamically.)

   b) You should simplify loop structures as much as possible. (For example, use
      the modulus operator (%) instead of of loop to extract a digit from a
      number.)

   c) You should use a for-loop to implement a fixed iteration. You should use a
      while-loop or a d-while loop for an indefinite iteration.

   d) You should not declare a data member that could be declared as a local
      variable in a member function.

   e) You should use descriptive names in varialble declarations. (For example,
      balance vs b.)

   f) You should use the #define directive to define the maximum size of an
      array.

   g) You should provide grammatically-correct comments to explain your
      programming logic.

   h) You should use indentation and blank lines to make your code readable.

3. You will receive 100% of the marks if you have created an enhanced version of
   a3main.cpp that does robust input validation. For example, your enhanced main
   program will validate the following input:

     EAN (0 to quit) : 978907ABC2046
     >>> error message: BAD DATA FORMAT
     EAN (0 to quit) : 9789070002046
     Quantity (0 to quit) : 25xyz
     >>> error message: BAD DATA FORMAT
     Quantity (0 to quit) : 25