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The easiest example for modulus arithmetic is "clock" arithmetic, that is, counting hours on a n-hour clock, if your modulus is n :

4 =~ 8 =~ 0 =~ -4 =~ -8 (4) 3 =~ 4 == 3 (4) -3 =~ 4 == 1 =~ 4 == 1 (4)

In principle, while the value is not within the range 0..n-1, you add/subtract the modulus to get closer to that range. So C is "wrong", because C implements the modulus as the remainder of the division, and Perl is right, because it implements the modulus as the modulus.

perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ; # The $d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider ($c = $d->accept())->get_request(); $c->send_response( new #in the HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' # web

In reply to Re: Modulus Inconsistencies (Or Calling all Mathematicians) by Corion
in thread Modulus Inconsistencies (Or Calling all Mathematicians) by RollyGuy

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