From: Hunter's Lists <lists@...>
Date: 2005-12-13T09:21:17+09:00
Subject: Re: Using Float For Currency

Thanks. Fortunately this is just some quick guestimation throw-away stuff.

No real need for precision. I will take a look at BigDecimal but in the
meantime, any thoughts on the original question?

Thx

> From: <mental@rydia.net>
> Reply-To: <ruby-talk@ruby-lang.org>
> Date: Tue, 13 Dec 2005 09:12:56 +0900
> To: ruby-talk ML <ruby-talk@ruby-lang.org>
> Subject: Re: Using Float For Currency
> 
> Quoting Hunter's Lists <lists@lastonepicked.com>:
> 
>> Howdy,
>> 
>> I have some methods that manipulate floats that represent a
>> currency amount.
>> 
>> I often end up with more precision than I need, i.e.: $9.756.
>> 
>> What is the best way to scale that to 9.76?
> 
> If you're doing anything that matters, don't use floats for
> currency.  There are a lot of really nasty subtle issues that will
> lose money between the cracks.
> 
> Usually you want a specialized currency type which uses
> fixed-precision arithmetic.
> 
> -mental
>