Due: 3/21/2007

Instructions:
Put your main function in hw4.cpp.
Place class files in appropriate interface and implementation filenames.

Design a program that implements the class Book.

Your main program should open a file, read in an array of books
from the file, manipulate them to test your functions and then
write the results into another file.

For now, the class Book has a number of pages, a title, 
and a single author name. The Book class should also have a field
for the ISBN number which is a unique 10 digit number.

Overload the input and output operators for your class Book.

Overload addition. The addition of two books is a book with twice as
many pages, an authorname that is the concatenation of the previous
author's names, and an ISBN # that is the addition of the two ISBN #'s
truncated to 10 digits. The new title of the book should also be the
concatenation of the previous author's names. While this does not give
great results, it is a rough approximation for our purposes.

Example: given the following books
  AbsoluteC  1100000000  Weiss  586
  DataStructures  9900000000 Savitch 945

Adding the first book with the second should give.
  AbsoluteCDataStructures 1000000000 WeissSavitch 1531



Hand in to me:
README describing difficulties, issues or general comments.
Do not repeat the assignment to me, as I am well aware of
what you need to accomplish. However, DO point out any
assumptions or clarifications. Did you use friends?

enscript version of your source files and a scripted version of your
execution, with several attempts.