File list (Check if you may need any files):
1\add.cpp
.\add.dsp
.\add.dsw
.\add.ncb
.\add.opt
.\add.plg
.\add_item.cpp
.\add_item.dsp
.\add_item.dsw
.\add_item.ncb
.\add_item.opt
.\add_item.plg
.\add_item2.cpp
.\avg_price.cpp
.\count.cpp
.\count.dsp
.\count.dsw
.\count.ncb
.\count.opt
.\count.plg
.\data\add
.\....\add_item
.\....\book_sales
.\....\mysum
.\Debug\add.obj
.\.....\add.pch
.\.....\vc60.idb
.\.....\vc60.pdb
.\forcount.cpp
.\for_ex.cpp
.\item_io.cpp
.\main_only.cpp
.\makefile
.\mysum.cpp
.\README.TXT
.\runpgms.bat
.\Sales_item.h
.\userforcount.cpp
.\whilecount.cpp
.\data
.\Debug
1