22 lines
834 B
Text
22 lines
834 B
Text
;Task:
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Validate the check digit of an ISBN-13 code:
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::* Multiply every other digit by '''3'''.
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::* Add these numbers and the other digits.
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::* Take the remainder of this number after division by '''10'''.
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::* If it is '''0''', the ISBN-13 check digit is correct.
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You might use the following codes for testing:
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::::* 978-0596528126 (good)
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::::* 978-0596528120 (bad)
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::::* 978-1788399081 (good)
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::::* 978-1788399083 (bad)
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Show output here, on this page
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;See also:
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:* for details: [https://isbn-information.com/the-13-digit-isbn.html 13-digit ISBN method of validation]. (installs cookies.)
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