Re: [xsl] XPath MOD 10 calculation

Subject: Re: [xsl] XPath MOD 10 calculation
From: "Andrew Welch" <andrew.j.welch@xxxxxxxxx>
Date: Fri, 25 May 2007 16:27:49 +0100
On 5/25/07, David Carlisle <davidc@xxxxxxxxx> wrote:
Note you only need to do that if calculating the check digit, (when it
matters that you get 0 not 10) if you are just checking that a given
checksum is right then you don't need that complication as using 10 or 0
is the same in a (..) mod 10 = 0 test.

If you a_re_ calculating the digit, rather than write
(10 - (foo mod 10)) mod 10
it's probably more natural just to use
-(-foo mod 10)

Out of interest, why is:

-(-foo mod 10)

not the same as:

foo mod 10


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