From: Michael Neumann <mneumann@...>
Date: 2004-05-13T02:24:04+09:00
Subject: Re: Major Addition Bug?

On Thu, May 13, 2004 at 02:07:52AM +0900, Sean O'Dell wrote:
> On Wednesday 12 May 2004 09:53, ts wrote:
> > >>>>> "S" == Sean O'Dell <sean@celsoft.com> writes:
> >
> > S> raise "false" if ((625.91 + 900.00 + 22.00) != 1547.91)
> >
> >  Well, this is well known
> 
> Well known?  I had no idea this bug existed until I wrote a line of code that 
> double-checked the arithmetic from a different app.  I have code all over 
> doing simple arithmetic like this.  Ruby can't add 3 simple numbers?  I don't 
> mean to be disproportionately negative, but that shakes my faith more than a 
> little.  It's just simple arithmetic.  How old is this bug?  When is it 
> getting fixed?

Try the same in Python. It's the same. 

In Ruby you can use BigDecimal:

  require 'bigdecimal'
  BigDecimal.new("625.91") + 900 + 22 == BigDecimal.new("1547.91") # => true

Regards,

  Michael