From: Jeff Vogt <rubyforum@...>
Date: 2009-02-14T03:05:09+09:00
Subject: Re: Bug in converting float to int?

Gary Wright wrote:
> Ruby floating point values are stored in binary format.
> 10.12 (decimal) can not be represented exactly in binary:
> 
>  >> sprintf("%0.50f", 10.12)
> => "10.11999999999999921840299066388979554176330566406250"

Clifford Heath wrote:

> Avoid using floating point. Seriously. Some might advice you to round:
> (a*100).round => 1012, but that's *unreliable*, even with some quite
> small number of digits.
> 
> Store cents as an integer, or use BigDecimal.

Thanks everyone, quite interesting info there. It looks like I will be 
doing my dollars to cents math a little differently.

Clifford, can you elaborate on why round is unreliable?
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