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NAME
    randbit - Blum-Blum-Shub pseudo-random number generator

SYNOPSIS
    randombit([x])

TYPES
    x		integer

    return	integer

DESCRIPTION
    If x > 0, randombit(x) returns a pseudo-random integer in [0, 2^x),
    i.e. the same as rand(2^x).	 If the integer returned is

	    b_1 * 2^(x-1) + b_2 * 2^(x-2) + ... + b_n,

    where each b_i is 0 or 1, then b_1, b_2, ..., b_n may be
    considered as a sequence of x random bits.

    If x <= 0, randombit(x) causes the random-number generator to skip
    abs(x) bits, and returns abs(x).

    If x is omitted, it is assumed to have the value of 1.

    See the random() help page for details on the additive 55 shuffle
    pseudo-random number generator.

EXAMPLE
    ; print srandom(0), randombit(20), randombit(20), randombit(20)
    RANDOM state 523139 567456 693508
    ; print srandom(0), randombit(-20), randombit(20), randombit(-20)
    RANDOM state 20 567456 20

LIMITS
    x != 0

LINK LIBRARY
    void zrandom(long cnt, ZVALUE *res)

SEE ALSO
    seed, srand, randbit, isrand, rand, srandom, israndom

## 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.
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: randombit,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/randombit,v $
##
## Under source code control:	1997/02/17 01:18:22
## 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/