ilog2

来自「Calc Software Package for Number Calc」· 代码 · 共 53 行

NAME
    ilog2 - floor of logarithm to base 2

SYNOPSIS
    ilog2(x)

TYPES
    x		nonzero real

    return	integer

DESCRIPTION
    Returns the greatest integer n for which 2^n <= abs(x).

EXAMPLE
    ; print ilog2(1), ilog2(2), ilog2(3), ilog2(4), ilog(1/15)
    0 1 1 2 -4

LIMITS
    none

LINK LIBRARY
    long qilog2(NUMBER *q)

SEE ALSO
    ilog10, ilog

## 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: ilog2,v 29.3 2006/05/07 07:25:46 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/ilog2,v $
##
## Under source code control:	1995/10/03 10:40:02
## File existed as early as:	1995
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/