Entering the ‘X’ character in ISBN Codes

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We have received a few emails from our users asking us how would they enter the ‘X’ character in the text field on the Enter Barcode screen of the Application.

Its Simple…. Just press the star (‘*’) or the pound (‘#’) key on your keypad and it will enter the X character.

Why do ISBN codes have the ‘X’ character in the end ?
The last character of the ISBN code is the checksum value that is used to validate the barcode. ISBN codes use MOD 11 checksum logic while creating the code. With this approach there is a possibility of having 11 characters ( 0 to 9 and 10) as the final checksum value. Since the checksum character can only be one character, the checksum value for 10 is entered as ‘X’.

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