Lookup tabled were my first idea too ... but why not a string of digits together at the same time?

Am I missing something?

6 digits are 1 million entries, probably using substr is even faster than array lookup, for sure it's demanding less memory.

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

In reply to Re^2: Faster Luhn Check Digit Calculation? by LanX
in thread Faster Luhn Check Digit Calculation? by kschwab

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