From: ara.t.howard@...
Date: 2006-11-09T02:47:16+09:00
Subject: Re: Simple Math Problem

On Thu, 9 Nov 2006, Thom Loring wrote:

> Can anyone shed some light on a simple math problem I have encountered?
> I am doing a very simple calculation, and the comparison of that result
> compared to the number itself is returning false in some cases...for
> instance:
>
> $irb
>>> v1 = 80.04
> => 80.04
>
>>> v2 = 0.12 * 667
> => 80.04
>
>>> v1 == v2
> => false
>
>>> v1 > v2
> => true
>
>>> v1 < v2
> => false
>
>>> v1.inspect
> => "80.04"
>
>>> v2.inspect
> => "80.04"
>
> Any insight?
>
> Thanks,
> Thom


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

-a
-- 
my religion is very simple.  my religion is kindness. -- the dalai lama