> From: John Stiles <email@hidden>
> Date: Fri, 31 Dec 2004 17:08:38 -0800
> To: Dev Cocoa <email@hidden>
> Cc: Brendan Younger <email@hidden>, Mark Dawson <email@hidden>
> Subject: Re: Accurate decimal numbers?
>
> On Dec 31, 2004, at 4:42 PM, Brendan Younger wrote:
>
>> Avoiding int<->float conversions is always best. I'd suggest if(0.0
>> == fabs(x - rint(x)), but I don't claim to be the expert on this.
>>
> If you're going to compare against zero, why use absolute value?
> 0 == -0.
> I'd probably use "floor(x) == x"; since it makes a function call, it's
> not the fastest technique possible, but the intent is crystal clear and
> in 99.9% of cases, that's more important.
> (After dropping the fabs and algebraic simplification, your version is
> just "rint(x) == x", basically the same thing.)
Wouldn't
floor(x) == ceil(x)
Be even better? Or does comparing the int vs the float not necessitate an
extra call?
Mark
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