From: brabuhr@...
Date: 2009-08-12T10:21:57+09:00
Subject: [ruby-core:24872] Re: [Bug #1925] Division of negative numbers

On Tue, Aug 11, 2009 at 7:17 AM, Roswitha Rissner<redmine@ruby-lang.org> wrote:
> Bug #1925: Division of negative numbers
> http://redmine.ruby-lang.org/issues/show/1925
>
> Author: Roswitha Rissner
> Status: Open, Priority: Normal
> ruby -v: ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32]
>
> The divison ot two numbers a and b isn't complient to the specification.
> In case a*b < 0, the result of a/b the same as a.divmod(b)[0].
> Example: 13/-4 => -4; 13.divmod(-4) = [-4,-3].
> According to http://www.ruby-doc.org/core/ the quotient of 13 and -4 should be -3.

More specific link:
http://www.ruby-doc.org/core/classes/Numeric.html#M000179

The documentation is incorrect and should read -4, yes?

   a    |  b  |  a.divmod(b)  |   a/b   | a.modulo(b) | a.remainder(b)
   13   | -4  |  -4,   -3     |  -3     |   -3        |     1