isprime.c
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上传日期:2022-08-06
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- /* Classify numbers as probable primes, primes or composites.
- With -q return true if the following argument is a (probable) prime.
- Copyright 1999, 2000, 2002, 2005 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free Software
- Foundation; either version 3 of the License, or (at your option) any later
- version.
- This program 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 General Public License for more details.
- You should have received a copy of the GNU General Public License along with
- this program. If not, see http://www.gnu.org/licenses/. */
- #include <stdlib.h>
- #include <string.h>
- #include <stdio.h>
- #include "gmp.h"
- char *progname;
- void
- print_usage_and_exit ()
- {
- fprintf (stderr, "usage: %s -q nnnn", progname);
- fprintf (stderr, "usage: %s nnn ...n", progname);
- exit (-1);
- }
- int
- main (int argc, char **argv)
- {
- mpz_t n;
- int i;
- progname = argv[0];
- if (argc < 2)
- print_usage_and_exit ();
- mpz_init (n);
- if (argc == 3 && strcmp (argv[1], "-q") == 0)
- {
- if (mpz_set_str (n, argv[2], 0) != 0)
- print_usage_and_exit ();
- exit (mpz_probab_prime_p (n, 5) == 0);
- }
- for (i = 1; i < argc; i++)
- {
- int class;
- if (mpz_set_str (n, argv[i], 0) != 0)
- print_usage_and_exit ();
- class = mpz_probab_prime_p (n, 5);
- mpz_out_str (stdout, 10, n);
- if (class == 0)
- puts (" is composite");
- else if (class == 1)
- puts (" is a probable prime");
- else /* class == 2 */
- puts (" is a prime");
- }
- exit (0);
- }