69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
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/* Classify numbers as probable primes, primes or composites.
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With -q return true if the folowing argument is a (probable) prime.
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Copyright 1999, 2000, 2002, 2005 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
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Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include <stdlib.h>
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#include <stdio.h>
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#include "gmp.h"
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char *progname;
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void
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print_usage_and_exit ()
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{
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fprintf (stderr, "usage: %s -q nnn\n", progname);
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fprintf (stderr, "usage: %s nnn ...\n", progname);
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exit (-1);
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}
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int
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main (int argc, char **argv)
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{
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mpz_t n;
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int i;
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progname = argv[0];
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if (argc < 2)
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print_usage_and_exit ();
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mpz_init (n);
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if (argc == 3 && strcmp (argv[1], "-q") == 0)
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{
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if (mpz_set_str (n, argv[2], 0) != 0)
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print_usage_and_exit ();
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exit (mpz_probab_prime_p (n, 5) == 0);
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}
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for (i = 1; i < argc; i++)
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{
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int class;
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if (mpz_set_str (n, argv[i], 0) != 0)
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print_usage_and_exit ();
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class = mpz_probab_prime_p (n, 5);
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mpz_out_str (stdout, 10, n);
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if (class == 0)
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puts (" is composite");
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else if (class == 1)
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puts (" is a probable prime");
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else /* class == 2 */
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puts (" is a prime");
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}
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exit (0);
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}
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