• (nodebb)

    Your so called "credit card number" is not actually a number; it is a digit string. And the last four digits are also a digit string.

    I've been saying this or things like it for yonks and yonks and yonks and YONKS.

  • (nodebb)

    Arithmetic and mathematics are not the same thing. The inability to do arithmetic accurately is not an indication that you can't do (or teach) calculus - or vice versa.

  • Die Kuhe (kein roboter) (unregistered)

    Considering the last four digits as number is not necessarily wrong: when the user inputs "0000" it's read as number 0, and comparing it with a stored number 0 should work as expected. The details depend of course on what they actually do with the data.

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