Computer Forums UPC Bar codes.
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 08-18-2009, 06:01 PM #1 Solid State Member     Join Date: Aug 2009 Posts: 12 UPC Bar codes. My question comes from my professor as an extra credit. "how many UPC codes can be made?" although I have spent several hours trying to find out I still have yet to get any answer at all. If anyone knows or has any idea at all I would love to hear it. Thx! __________________
 08-18-2009, 06:24 PM #2 Site Team     Join Date: Jul 2009 Location: England, UK Posts: 3,422 Re: UPC Bar codes. Are we talking about UPC-A codes here? There's a few different types, UPC-A being the most common, but the number of possible codes would differ depending on what type is in use... __________________
 08-18-2009, 06:31 PM #3 Solid State Member     Join Date: Aug 2009 Posts: 12 Re: UPC Bar codes. I'm sorry to say that was not specified. If you do know either then I suppose I would use that and then bring up the different types in my next class.
 08-18-2009, 06:40 PM #4 Site Team     Join Date: Jul 2009 Location: England, UK Posts: 3,422 Re: UPC Bar codes. If it wasn't specified then he means UPC-A UPC-A codes are made up of 12 decimal digits (there's a few non-decimal fixed ones in there as well but we don't need to worry about them if we're just interested in the number available.) However, the last decimal digit is a checksum, so that doesn't count either. That gives us 11 decimal digits to play with - the first digit isn't a free for all, I think 1-5 are reserved for various special uses while 0 and 6-9 aren't - but I'm ignoring practicalities for this example. This gives us therefore however many combinations we can make with 11 decimal digits, which I make as 100,000,000,000 - 100 (US) billion or 100 thousand million to be more specific

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