pmodm127

来自「Calc Software Package for Number Calc」· 代码 · 共 79 行

NAME
    pmodm127 - calculate q mod 2^(2^127-1)

SYNOPSIS
    custom("pmodm127", q)

TYPES
    q		int > 0

    return	int

DESCRIPTION

    This custom function will return the value:

    	q mod 2^(2^127-1)

    This custom function serves as a demonstration of how to write
    a custom function.  It performs the equivalent of:

	pmod(2, 2^127-1, q)

    The return value is integer in the half open range: [0, q).

    SPECIAL NOTE:

	Can you find a value, q, for which this custom function returns 1?
	If you do, send the value of q to chongo using the EMail address
	found at:

	    http://www.isthe.com/chongo/address.html

EXAMPLE
    > custom("pmodm127", 65537)
	    32769

    > custom("pmodm127", 2^31-1)
	    8

    > custom("pmodm127", 7^51+2)
	    11228202966269457258557496419097462731193173

LIMITS
    calc must be built with ALLOW_CUSTOM= -DCUSTOM
    calc must be executed with a -C arg.
    q must be an integer > 0

LIBRARY
    none

SEE ALSO
    custom

## Copyright (C) 2004  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: 29.2 $
## @(#) $Id: pmodm127,v 29.2 2004/07/29 09:28:58 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/custom/RCS/pmodm127,v $
##
## Under source code control:	2004/02/25 07:13:15
## File existed as early as:	2004
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/