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)

[download]

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

[download]

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

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.