ATM / ISBN checker

Updated Tue Jun 13 16:47:06 EDT 2023 to handle ISBN-13 as well.

These Javascript programs verify the 16-digit number on ATM and credit cards, and the 10- and 13-digit ISBN's on books. Enter the number (no spaces or dashes) and push the proper button.


View the source to see how they work.

Exercise: translate them into Python.

Another exercise: allow dashes and spaces.