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72 lines
1.8 KiB
Plaintext
72 lines
1.8 KiB
Plaintext
/*
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* smallfactors - find the factors of a number < 2^32
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*
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* Copyright (C) 2013 Christoph Zurnieden
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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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static resource_debug_level;
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resource_debug_level = config("resource_debug", 0);
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define smallfactors(x0)
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{
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local d q x flist tuple w;
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if (x >= (2 ^ 32) - 1)
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return newerror("smallfactors: number must be < 2^32 -1");
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tuple = mat[2];
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flist = list();
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x = x0;
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d = 2;
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q = 0;
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tuple[0] = d;
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if (x < 2)
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return 0;
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do {
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q = x // d;
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while (x == (q * d)) {
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tuple[0] = d;
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tuple[1]++;
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x = floor(q);
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q = x // d;
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}
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d = nextprime(d);
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if (tuple[1] > 0)
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append(flist, tuple);
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tuple = mat[2];
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} while (d <= x);
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return flist;
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}
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define printsmallfactors(flist)
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{
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local k;
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for (k = 0; k < size(flist); k++) {
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print flist[k][0]:"^":flist[k][1];
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}
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}
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config("resource_debug", resource_debug_level),;
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if (config("resource_debug") & 3) {
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print "smallfactors(x0)";
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print "printsmallfactors(flist)";
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}
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