On 5/25/07, Abel Braaksma <abel(_dot_)online(_at_)xs4all(_dot_)nl> wrote:
Andrew Welch wrote:
> to give you the check-digit? If so it makes the outermost "mod 10" of
> $calc redundant? (if it is then step #4 on the wikipedia article isnt
> needed)
It is needed for calculating the check digit, in the special case that
the steps 1..3 produce 10 (which is, if the $totalsums mod 10 equal 0).
10 is not allowed as digit. Doing modulo 10, will give 0.
Ahh - thanks for the clarification.
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