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From: "Gerd Termathe" <gerd DOT termathe AT fujitsu-siemens DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: to check given no. is power of 2
Date: Wed, 25 May 2005 11:58:34 +0200
Organization: Fujitsu Siemens Computers GmbH
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"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;
}

Gerd