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From: Martin Ambuhl <mambuhl AT earthlink DOT net>
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Subject: Re: to check given no. is power of 2
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Date: Wed, 25 May 2005 18:39:59 GMT
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Gerd Termathe wrote:
> "aveo" <rahul DOT h AT gmail DOT com> schrieb im Newsbeitrag
> news:1116997063 DOT 905915 DOT 71670 AT z14g2000cwz DOT googlegroups DOT com...
> 
>>hi all
>>i need a C code that checks given no. is power of 2 or not without
>>checking any condition.
>>
> 
> 
> int is_power_of_2 (int N)
> {
>  if ( N!=0 && (N&(N-1))==0 ) return 1; else return 0;
> }

Why an if ... else?
Why use uppercase for non-macros?
Why use signed integers?

inline unsigned is_power_of_2 (unsigned n)
{
   return (n && !(n&(n-1)));
}