Checksums: The Luhn Algorithm for Verifying Credit Card Numbers

The Luhn Algorithm is used to catch common input errors for credit card numbers: transposition or mistyping one or more digits. In this video I'll show you how to Luhn Algorithm works and why merchants want to catch these error before running the transaction.

[@hassanm7865]

Thank you, professor; this video helped me much!

[@profbbrown]

Glad it helped!

[@ericamitchell8521]

Such a good explanation, thanks!

[@AJay-vy8fq]

Great explanation. Thank you.

[@honiel59]

so clear to understand

[@tensie4674]

goddamn cs50