Originally posted by: paul.brett

I enclose an implementation of the Luhn algorithm, used to check the validity of credit card numbers.

It works, but it's not very elegant.  Build all maps, and run Luhn1.mmc to check the dummy card number in Input.txt.

See what you can do to improve this.  It is possible to do this without RUN() maps I believe.

Thank-you.

Paul.

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