I've not used it myself, but there is also NSDecimal that may be an 
alternative.  Also, I recall seeing an IBM-released class that I believe had 
been part of ICU that also did decimal arithmetic using 32 or 64 bits.

>
>On Oct 10, 2008, at 5:04 AM, Steven Hamilton wrote:
>
>> Am I totally misunderstanding something about floats? Or is the  
>> extra ##'s in the formatter making things up?
>
>
>Floating point values of either float or double are not guaranteed to  
>be super precise, and should never be used to represent currency  
>values. Try using a long long instead, and have the first two digits  
>represent a fractional unit of currency.
>
>Nick Zitzmann
><http://www.chronosnet.com/>
>
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