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Topic: Formula Help Posted: 19 Aug 2008 at 10:23am
Hi,
I need a formula to check if a UPC is Valid or Invalid. Here is an example of one of our valid UPC numbers: 664232041103. A UPC is valid if you add digit 1,3,5,7,9,11 multiply by 3 and then add that to the sum of digits 2,4,6,8,10 THEN add digit 12 and the total should be divisible by 10. So if anyone wants to take a whack at this one I would be greatful. Thanks
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Posted: 19 Aug 2008 at 11:13am
haha. This is funny. I had no idea you do use this formula to validate whether a UPC is valid. Cool.
Here is a formula I would use. I'm not testing this, so there is probably a small bug. But I'm taking what you said and just writing what I would do off the top of my head. It should be pretty close the final version and you can tweak it accordingly. Here you go...
Man, there's like a hundred parentheses in this. I'm sure I screwed a few of them up. So you'll have to double check that they are all in place and that an openning parentheses has a matching closing parentheses. But overall this should be pretty good.
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Joined: 14 Aug 2008
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Posted: 19 Aug 2008 at 12:28pm
Thanks Brian,
I think this is pretty close, except when I put this formula onto the report the only UPC'S that returned a true value were the ones that had a check digit of either 0 or 5. That should not be the case. Let me know if you have any more thoughts. Thanks
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Posted: 19 Aug 2008 at 12:59pm
Unfortanately, I would have to create a test report with sample data to figure this out. I simply don't have the time to debug this in detail. I suggesst breaking out the formula into separate calculations (one for the odd digits, one for the even digits) and then creating a fomula using those variables. That would make it easy to test which part of the formula is working and which is returning the wrong value.
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Posted: 28 Aug 2008 at 6:53am
I was looking at the formula, and it looked right, I was just about to close it when it dawned on me what is missing...each of the mids should end , 1. The current formula is going from say the 3rd int to the end, it should only be adding the 3rd char...so the formula should look like:
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