From: yermej <yermej@...>
Date: 2008-03-14T08:40:21+09:00
Subject: Re: strange results.. ?

On Mar 13, 5:59 pm, psy <p...@matt-schwarz.com> wrote:
> [Note:  parts of this message were removed to make it a legal post.]
>
> Hello people,
>
> Here I get some strange (for me) results :
>
> irb(main):012:0> 0.4 - 0.3 - 0.1
> => 2.77555756156289e-17
>
> irb(main):013:0> 0.5 - 0.4 - 0.1
> => -2.77555756156289e-17
>
> irb(main):017:0> 0.2 + 0.7 - 0.9
> => -1.11022302462516e-16
>
> Can somebody explain what happens here or point me some place where i
> can get information for this topic?
> Thanks in advance!

http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems