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Card number validation #1011

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MichalMarsalek opened this issue Sep 23, 2023 · 1 comment

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MichalMarsalek commented Sep 23, 2023 •

edited

Description
Given a list of payment card numbers, output valid if it passes the Luhn check and invalid otherwise.

Example input

4242 4242 4242 4242
4242 4244 4242 4242
5555 5555 5555 4444
5555 5555 5555 5444
3566 0020 2036 0505
3656 0020 2036 0505

Example output

valid
invalid
valid
invalid
valid
invalid

We might stick to the most common 16 digit card numbers, or we might allow any length.

The text was updated successfully, but these errors were encountered:

MichalMarsalek added idea hole-idea labels

Contributor

kg583 commented Sep 23, 2023

Maybe we just output the valid ones like in Pangram Grep? Choosing specific strings to represent booleans feels out of spirit for this site.

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