Re: why use pow(x, 2)?
Re: why use pow(x, 2)?
- Subject: Re: why use pow(x, 2)?
- From: "Gary L. Wade" <email@hidden>
- Date: Mon, 02 Nov 2009 12:08:58 -0700
- Thread-topic: why use pow(x, 2)?
On 11/02/2009 12:37 PM, "Luke the Hiesterman" <email@hidden> wrote:
> Would it really be that much faster? I don't know exactly how pow() is
> implemented, but I assume it's basically just a loop of
> multiplications, in which case it would basically be the same as x*x
> in this case, since it would exit after the first iteration....
>
> Luke
pow takes a double for the parameter, not an integer, so pow doesn't
necessarily perform a loop (it may effectively be a single machine
instruction). Also, in early Rosetta releases of Mac OS X, we found that
doing pow(10,3) would produce 1000.00...01 rather than 1000, which was
definitely a bug, but it illustrates the difference.
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