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54 lines
1.5 KiB
Plaintext
54 lines
1.5 KiB
Plaintext
#!/usr/local/src/bin/calc/calc -q -f
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/*
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* mersenne - print the value of a mersenne number
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*
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* Copyright (C) 1999-2007,2014,2019,2021 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 1999/11/30 00:09:01;
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* File existed as early as: 1999
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*
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* usage:
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* mersenne exp
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*/
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/*
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* parse args
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*/
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argc = argv();
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stderr = files(2);
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program = argv(0);
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if (argc != 2) {
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/* we include the name of this script in the error message */
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fprintf(stderr, "usage: %s exp\n", program);
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abort "wrong number of args";
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}
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n = eval(argv(1));
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if (!isint(n) || n <= 0) {
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quit "Argument to be a positive integer";
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}
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/*
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* print the decimal value of 2^n-1
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*/
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print "2^": n : "-1 =", 2^n-1;
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