delorie.com/archives/browse.cgi | search |
X-Authentication-Warning: | delorie.com: mail set sender to djgpp-bounces using -f |
From: | Martin Ambuhl <mambuhl AT earthlink DOT net> |
User-Agent: | Mozilla Thunderbird 1.0.2 (Windows/20050317) |
X-Accept-Language: | en-us, en |
MIME-Version: | 1.0 |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: to check given no. is power of 2 |
References: | <1116997063 DOT 905915 DOT 71670 AT z14g2000cwz DOT googlegroups DOT com> <d71i5h$t6h$1 AT nntp DOT fujitsu-siemens DOT com> |
In-Reply-To: | <d71i5h$t6h$1@nntp.fujitsu-siemens.com> |
Lines: | 23 |
Message-ID: | <3E3le.7676$M36.381@newsread1.news.atl.earthlink.net> |
Date: | Wed, 25 May 2005 18:39:59 GMT |
NNTP-Posting-Host: | 165.247.24.140 |
X-Complaints-To: | abuse AT earthlink DOT net |
X-Trace: | newsread1.news.atl.earthlink.net 1117046399 165.247.24.140 (Wed, 25 May 2005 11:39:59 PDT) |
NNTP-Posting-Date: | Wed, 25 May 2005 11:39:59 PDT |
Organization: | EarthLink Inc. -- http://www.EarthLink.net |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
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))); }
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |