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48 lines
1.5 KiB
Plaintext
48 lines
1.5 KiB
Plaintext
#!/usr/local/src/cmd/calc/calc -S
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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 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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# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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#
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# @(#) $Revision: 29.2 $
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# @(#) $Id: mersenne.calc,v 29.2 2000/06/07 14:02:59 chongo Exp $
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# @(#) $Source: /usr/local/src/cmd/calc/cscript/RCS/mersenne.calc,v $
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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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# usage:
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# mersenne exp
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/*
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* parse args
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*/
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if (argv() != 1) {
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/* we include the name of this script in the error message */
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fprintf(files(2), "usage: %s exp\n", config("program"));
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abort "wrong number of args";
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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^": argv(0) : "-1 =", 2^eval(argv(0))-1;
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