count of bits set in a long

[Bill Parke]

In article <34281 at cup.portal.com>, ts at cup.portal.com (Tim W Smith) writes:
|> From: ts at cup.portal.com (Tim W Smith)
|> Newsgroups: comp.lang.c
|> Subject: Re: count of bits set in a long
|> 
|> How about something like this?
|> 
|> int	NumberOfBitsInLong( register unsigned long input )
                                     ^^^^^^^^
		Not necessary
|> {
|> 	register int count;
|> 
|> 	for ( count = 0; input != 0; count++ )
|> 		input &= input-1;
	This will count bits in a signed number (see
	my previous posting of this using "while" )
|> 
|> 	return count;
|> }
|> 
|> 						Tim Smith
|> 
--
Bill Parke 			parke%star.enet.dec at decwrl.dec.com
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The views expressed are my own.