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UPC check digit calculation

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    #1

    UPC check digit calculation

    I have an app using A5V8 and I need to add a check digit to a UPC barcode values where that check digit had been removed by someone else.

    I assume this would be done via an update. If I'm wrong let me know.

    I have some instructions and sample code (unfortunately it's in Visual Basic)

    How would I make it go? see instructions and sample code below

    Thanks in advance.

    UPC barcodes include a check digit. The UPC check digit is the 12th digit in the lower-right corner of the barcode. Here's how to calculate a UPC barcode check digit
    The last digit in a UPC barcode is a check digit based on the previous 11 numbers. Our example barcode data is "41234554321"
    Add up the numbers in the odd positions left to right. Multiple the result by 3. Add up the numbers in the even positions. Now add the first subtotal to the second. The UPC barcode check digit is the single digit number makes the total a multiple of 10.
    4+2+4+5+3+1=19 19x3=57 1+3+5+4+2=15 57+15=72 and 8 makes 80
    In VBA/Visual Basic it looks something like this:


    Dim checkDigitSubtotal As Integer ' check digit throwaway

    ' Valid input is 11-digits (no check digit), 12-digits (with check digit), or 14-digits (GTIN).
    Select Case Len(UPCnumber)
    Case 11
    ' do check digit calculation
    Case 12
    ' lets ignore your check digit & use ours
    UPCnumber = Left(UPCnumber, 11)
    Case 14
    ' GTIN input, strip leading 2 characters & last one too;
    UPCnumber = Mid(UPCnumber, 3, 11)
    Case Else
    ' error handling goes here
    End Select

    ' do the check digit
    checkDigitSubtotal = (Val(Left(UPCnumber, 1))) + (Val(Mid(UPCnumber, 3, 1))) + (Val(Mid(UPCnumber, 5, 1))) + (Val(Mid(UPCnumber, 7, 1))) + (Val(Mid(UPCnumber, 9, 1))) + (Val(Right(UPCnumber, 1)))
    checkDigitSubtotal = (3 * checkDigitSubtotal) + (Val(Mid(UPCnumber, 2, 1))) + (Val(Mid(UPCnumber, 4, 1))) + (Val(Mid(UPCnumber, 6, 1))) + (Val(Mid(UPCnumber, 8, 1))) + (Val(Mid(UPCnumber, 10, 1)))

    Azalea_UPC_A_checkDigit = Right(Str(300 - checkDigitSubtotal), 1)

    End Function
    Tags: None
    #2
    Re: UPC check digit calculation

    Let Alpha do it for you....

    chkdigit()
    There can be only one.

    Comment

      #3
      Re: UPC check digit calculation

      That will calculate it for a single number, how would I calculate the check digit for 100K or more entries for a field in a table ?

      Comment

        #4
        Re: UPC check digit calculation

        One at a time, with an update operation.

        By one at a time I mean create an update operation on the checkdigit field and have the expression

        chkdigit(upccodefield)
        There can be only one.

        Comment

          #5
          Re: UPC check digit calculation

          I'm getting closer.

          An update of the "Data_SKU" field using this formula:
          chkdigit(data_sku,2) gives the proper check digit but deletes the first part of the UPC. For example: 11122233344 after the update gives only the correct check digit of 6.

          What I want to do is turn the 11122233344 into 111222333446 which is the full 12-digit UPC code.

          What am I missing here ?

          Comment

            #6
            Re: UPC check digit calculation

            John,

            Data_SKU = "11122233344"
            chkdigit(data_sku,2) ="6"

            complete_upc = Data_SKU+chkdigit(data_sku,2)
            complete_upc = "111222333446"

            Create that calculated field and print it.
            There can be only one.

            Comment

              #7
              Re: UPC check digit calculation

              It's still a bit odd.

              When I use that formula in the expression builder it shows the check digit separated from the UPC.

              For example 11122233344 as the UPC shows like this in the expression builder example: 11122233344 6
              see attached JPEG

              But it shows up in the table as 11122233344 without the check digit of 6 being included.

              Getting closer but still a bit stumped why this is happening.

              Comment

                #8
                Re: UPC check digit calculation

                Ever noticed the Alpha trim functions and wonder what they are designed to do?

                Instead of a data_sku field of 11 characters you seem to have one of 12 characters.

                Data_SKU = "11122233344 "
                chkdigit(data_sku,2) ="6"
                complete_upc = Data_SKU+chkdigit(data_sku,2)
                complete_upc = "11122233344 6"

                Data_SKU = "11122233344 "
                chkdigit(data_sku,2) ="6"
                complete_upc = Data_SKU+trim(chkdigit(data_sku,2))
                complete_upc = "111222333446"
                There can be only one.

                Comment

                  #9
                  Re: UPC check digit calculation

                  Well, I finally did it.

                  For some unknown reason, A5 added 10 blanks leading the check digit. This caused the combo-data length to become larger then the field length could support and it was truncated. I made the field longer and could see both UPC and check digit within the same field but with blank spaces between the UPC and check digit.

                  I used this expression in the calculated field to combine fields and clean it up:
                  REMSPECIAL(DATA_SKU+TRIM(CHKDIGIT(DATA_SKU,2)))

                  Thanks Stan, I wouldn't have got here without you.
                  Last edited by John Cunradi; 01-26-2010, 02:52 PM. Reason: new info

                  Comment

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