| From: | Louis-David Mitterrand <cunctator(at)apartia(dot)ch> |
|---|---|
| To: | Mike Mascari <mascarm(at)mascari(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Off topic 'C' question |
| Date: | 2000-08-11 21:18:23 |
| Message-ID: | 20000811231823.A3877@styx |
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| Lists: | pgsql-hackers |
On Sat, Jul 29, 2000 at 09:38:33PM -0400, Mike Mascari wrote:
> I have a quick question. What is the quickest way to determine
> the next highest power of two which is greater than a given
> integer in 'C'. For example, given the number 7, I would like to
> return 8. Given the number 13, I would like to return 16, etc. Is
> there a gem to do this without shifting a bit value from 1 left
> up to a maximum of 32 (or 64) iterations?
You could use:
pow(x, ((int)(log(x)/log(2)) + 1));
--
Louis-David Mitterrand - ldm(at)apartia(dot)org - http://www.apartia.org
"Poor girl looks as confused as a blind lesbian in a fish market." -
Simon R. Green
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