#!/usr/bin/calc -q -s -f /* * mersenne - print the value of a mersenne number * * Copyright (C) 1999-2007,2014 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. * * Under source code control: 1999/11/30 00:09:01; * File existed as early as: 1999 * * chongo <was here> /\oo/\ http://www.isthe.com/chongo/ * Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/ * * usage: * mersenne exp */ /* * parse args */ if (argv() != 2) { /* we include the name of this script in the error message */ fprintf(files(2), "usage: %s exp\n", config("program")); abort "wrong number of args"; } global n = eval(argv(1)); if (!isint(n) || n <= 0) { quit "Argument to be a positive integer"; } /* * print the decimal value of 2^n-1 */ print "2^": n : "-1 =", 2^n-1;
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