How? Grocery Store Checkout

[raymanj]

I am trying to create a grocery style checkout program. I need some help in laying out the ground work and implementation.

Goals:

• 
  1. Allow user to scan barcode or manually enter item codes.
  2. Computer must determine prices based on rules
  a. quantity discount for item
  b. discount for bundled items
  c. flat percent discount based on customer
  d. flat percent discount based on total of sale
  

The difficult part I am having is implementing the rules

1. How do I look up the correct charging price based on items sales rules.

2. How do I store these rules and prices so they can be looked up during the sale?

I am at a lost in doing this. If anyone has done this before, it would be very helpful to show me some basic structure. I know this has been done on countless programs before.

Thanks

[comment]

See if these help:

http://www.fmforums.com/forum/showpost.php?post/294096/

http://fmforums.com/forum/showpost.php?post/300768/

[RodM]

I wrote a complete FM POS using BC...if your use code of 39 barcodes.. they are just numbers.. You could start developing without barcode by using a simple text box.. anticipate the read data ie. if the barcode # is 1000 the what you get when bardcoding the label is *1000* So i enter *1000* manually to facilate using a scanner.