On Mon, 8 Apr 2002, Tom Rogers wrote:
> At 09:16 AM 8/04/2002, Charlie Killian wrote:
>> I'd like to condense the function below into one line.
>>
>> function isOneBitSet($n)
>> {
>> $x = log($n)/log(2);
>> return ($x == intval($x));
>> }
>>
>> AND I don't want to do this:
>> return (log($n)/log(2) == intval(log($n)/log(2)));
>
> Not sure if this is the best way to do it:
> function isOneBitSet($n)
> {
> return !ereg("\.",strval(log($n)/log(2)));
> }
Beware; using a regular expression for this is slower than creating an
intermediate variable.
miguel
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