On 5/25/07, David Carlisle <davidc(_at_)nag(_dot_)co(_dot_)uk> 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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