A bookstore in file format each transaction. Every Transaction record sales of a book, containing ISBN (international standard book number, the world titles in each unique identifier), the number of copies sold and sales price. The owner During the period of viewing this document, statistics for each book sold copies, total sales income and the average selling price of algorithm

1\add.cpp
.\add_item.cpp
.\add_item2.cpp
.\avg_price.cpp
.\count.cpp
.\data\add
.\....\add_item
.\....\book_sales
.\....\mysum
.\Debug\mysum.exe
.\.....\mysum.ilk
.\.....\mysum.obj
.\.....\mysum.pch
.\.....\mysum.pdb
.\.....\vc60.idb
.\.....\vc60.pdb
.\forcount.cpp
.\for_ex.cpp
.\item_io.cpp
.\main_only.cpp
.\makefile
.\mysum.cpp
.\mysum.dsp
.\mysum.dsw
.\mysum.ncb
.\mysum.opt
.\mysum.plg
.\README.TXT
.\runpgms.bat
.\Sales_item.h
.\userforcount.cpp
.\whilecount.cpp
.\data
.\Debug
1

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