Re: How can I tell if a number is a power of 2?

err, I have no idea how this would benchmark, but couldn't you do

return ! $number % 2;
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You'd pay a penalty in the calculation, but by the time you get done with sprintf, pattern matching, and a conditional I think the gap would be a lot closer.

Originally posted as a Categorized Answer.

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Re: Re: How can I tell if a number is a power of 2? by VSarkiss (Monsignor) on Jan 28, 2002 at 23:16 UTC
Oops! You're testing whether `$number` is odd or even, not whether it's a power of 2.	[reply] [d/l]