From: bbiker <renard@...>
Date: 2008-08-28T08:25:29+09:00
Subject: Re: BigDecimal with Float comparision bug.

On Aug 26, 8:04 am, Sandor Szücs <sandor.szu...@fu-berlin.de> wrote:
> On 26.08.2008, at 13:09, Maciej Tomaka wrote:
>
>
>
>
>
> > Float:
> >>>BigDecimal.new("25.0") == 25.0
> > => false
> > Decimal:
>
> >>>BigDecimal.new("25.0") == 25
> > => true
>
> >>> (1..1000).select { |d|BigDecimal.new("#{d}.0") != d.to_f }.size
> > => 414
>
> > So 41.4% such comparisions are false!!!
>
> > What do you think about it?
>
> Maybe it is a plattform or version issue.
>
> On ruby 1.8.7 (2008-08-11 patchlevel 72) [i686-darwin8] it works as you
> expected.
>
> irb> require 'bigdecimal'
> => true
> irb>BigDecimal.new("25.0")
> => #<BigDecimal:4da044,'0.25E2',4(8)>
> irb>BigDecimal.new("25.0").to_f
> => 25.0
> irb>BigDecimal.new("25.0") == 25
> => true
> irb>BigDecimal.new("25.0") == 25.0
> => true
> irb> (1..1000).select { |d|BigDecimal.new("#{d}.0") != d.to_f }.size
> => 0
>
> regards, Sandor Szücs
> --

Works for me
irb(main):002:0> require 'bigdecimal'
=> true
irb(main):003:0> (1..1000).select { |d| BigDecimal.new("#{d}.0") !=
d.to_f }.size
=> 0

renard$ ruby -v
ruby 1.8.6 (2008-08-11 patchlevel 287) [i686-darwin9.4.0]