From: Tom Link <micathom@...>
Date: 2009-02-22T03:29:40+09:00
Subject: Re: floating point rounding error?

> Is there any BigFloat that avoids this?

BigDecimal:

require 'bigdecimal'
((BigDecimal("12.99")+BigDecimal("7.0"))*100).ceil
=> #<BigDecimal:101f8f8c,'0.1999E4',4(12)>
> ((BigDecimal("12.99")+BigDecimal("7.0"))*100).to_f.ceil
=> 1999

I think you have to take care though that the BigDecimal isn't
converted back into a normal float.

> (BigDecimal("12.99")+7.0).class
=> Float