> Looks like you've found a nice project to occupy your Sunday :)

Nay!

You know the saying: mathematicians are like eunuchs. ;)

I leave the "fun" - especially with C - to the engineers here ...

> six digits would only reduce by one 

Well you were the one talking about a general approach with unknown input length.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^6: Faster Luhn Check Digit Calculation? by LanX
in thread Faster Luhn Check Digit Calculation? by kschwab

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