ISBN13 check digit: Difference between revisions
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Validate the check digit of an ISBN-13 code. Use some good and bad codes of your choosing for testing. |
Validate the check digit of an ISBN-13 code. Use some good and bad codes of your choosing for testing. |
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Multiply every other digit by 3. Add the digits together. Take the remainder of division by 10. If it is 0, the ISBN-13 check digit is correct. |
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See https://isbn-information.com/the-13-digit-isbn.html for details on the method of validation. |
<p>See https://isbn-information.com/the-13-digit-isbn.html for details on the method of validation. |
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