t-fac_ui.c
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上传日期:2022-08-06
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- /* Exercise mpz_fac_ui.
- Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library 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 Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "tests.h"
- /* Usage: t-fac_ui [x|num]
- With no arguments testing goes up to the initial value of "limit" below.
- With a number argument tests are carried that far, or with a literal "x"
- tests are continued without limit (this being meant only for development
- purposes). */
- int
- main (int argc, char *argv[])
- {
- unsigned long n;
- unsigned long limit = 1500;
- mpz_t f, r;
- tests_start ();
- if (argc > 1 && argv[1][0] == 'x')
- limit = ULONG_MAX;
- else if (argc > 1)
- limit = atoi (argv[1]);
- /* for small limb testing */
- limit = MIN (limit, MP_LIMB_T_MAX);
- mpz_init_set_ui (f, 1); /* 0! = 1 */
- mpz_init (r);
- for (n = 0; n < limit; n++)
- {
- mpz_fac_ui (r, n);
- MPZ_CHECK_FORMAT (r);
- if (mpz_cmp (f, r) != 0)
- {
- printf ("mpz_fac_ui(%lu) wrongn", n);
- printf (" got "); mpz_out_str (stdout, 10, r); printf("n");
- printf (" want "); mpz_out_str (stdout, 10, f); printf("n");
- abort ();
- }
- mpz_mul_ui (f, f, n+1); /* (n+1)! = n! * (n+1) */
- }
- mpz_clear (f);
- mpz_clear (r);
- tests_end ();
- exit (0);
- }