I should clarify.  You *can* return nil, but it will be indistinguishable for 
0.0f.

Dave

On Jan 29, 2010, at 5:46 PM, Dave DeLong wrote:

> You can't do that.  Instead, return an NSNumber, from which you can deduce 
> that a nil NSNumber is different from an NSNumber with a floatValue of 0.0.
> 
> Cheers,
> 
> Dave

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