From: Mike Sassak <msassak@...>
Date: 2009-06-19T06:12:17+09:00
Subject: Re: floating point accuracy in JRuby

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When handling currency I'd suggest storing everything in cents with integers
and using a Money library like http://money.rubyforge.org/. You won't have
any rounding errors then.

On Thu, Jun 18, 2009 at 3:44 PM, Steven D. Arnold <
stevena@arnold-software.com> wrote:

> [ 03:23 PM (5) omega:thoth ~ ] > jirb
> irb(main):001:0> 0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1
> => 0.9999999999999999
> [ 03:33 PM (8) omega:thoth ~ ] > irb
> >> 0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1
> => 1.0
>
> Disappointing that JRuby does not handle floating point numbers (a) in the
> the same way as CRuby and (b) not as accurately.  Is the cost of
> implementing CRuby's behavior prohibitively high on the JVM, is there a fix
> planned in the future?  How would JRuby users recommend handling currency on
> that platform?
>
> steven
>
>

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