popcnt

来自「Calc Software Package for Number Calc」· 代码 · 共 60 行

NAME
    popcnt - number of bit that match a given value

SYNOPSIS
    popcnt(x [,bitval])

TYPES
    x		number (real or integer)
    bitval	0 or 1

    return	number

DESCRIPTION
    Count the number of bits in abs(x) that match bitval.  The default
    bitval is 1 which counts the number of 1 bits.

    The popcnt function is equivalent to #x when x is an integer.

EXAMPLE
    ; print popcnt(32767), popcnt(3/2), popcnt(pi(),0), popcnt(pi(),1)
    15 3 69 65

    ; print popcnt(randombit(128), 0), popcnt(randombit(128), 1)
    61 64

LIMITS
    none

LINK LIBRARY
    long zpopcnt(ZVALUE z, int bitval)

SEE ALSO
    none

## Copyright (C) 1999  Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL.  You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
##
## @(#) $Revision: 29.3 $
## @(#) $Id: popcnt,v 29.3 2006/05/07 07:25:46 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/popcnt,v $
##
## Under source code control:	1997/09/11 04:20:02
## File existed as early as:	1997
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/