From: Carl Youngblood <carl.youngblood@...>
Date: 2004-10-31T03:46:42+09:00
Subject: Re: Money Class (was Re: Rounding error, (100.0 * 9.95).to_i == 994)

Come to think of it, do all currencies even have "cents"?  I know of
some countries where the currency is so devalued that nobody uses
fractionary amounts.

On Sat, 30 Oct 2004 22:46:59 +0900, Francis Hwang <sera@fhwang.net> wrote:
> 
> On Oct 30, 2004, at 9:05 AM, Brian Schr�der wrote:
> 
> > Why not just use integer valued cent-counts?
> 
> Sometimes that's not sufficient. If you're an organization that has to
> deal with quantities and amounts priced in multiple currencies, you
> have to store both the number and the currency itself. 5 Euros, 10
> dollars, 42000 Korean won, etc. Then if you are adding or comparing
> them to one another you have to figure out how to sensibly model that.
> What's 5 Euros plus 10 dollars? Does it matter that the answer to that
> question changes over time, as exchange rates are constantly
> fluctuating?
> 
> It's a pretty interesting little domain. Martin Fowler devotes a few
> pages to it in Analysis Patterns.