t-divis.c
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上传日期:2022-08-06
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- /* test mpz_divisible_p and mpz_divisible_ui_p
- Copyright 2001, 2009 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"
- void
- check_one (mpz_srcptr a, mpz_srcptr d, int want)
- {
- int got;
- if (mpz_fits_ulong_p (d))
- {
- unsigned long u = mpz_get_ui (d);
- got = (mpz_divisible_ui_p (a, u) != 0);
- if (want != got)
- {
- printf ("mpz_divisible_ui_p wrongn");
- printf (" expected %d got %dn", want, got);
- mpz_trace (" a", a);
- printf (" d=%lun", u);
- mp_trace_base = -16;
- mpz_trace (" a", a);
- printf (" d=0x%lXn", u);
- abort ();
- }
- }
- got = (mpz_divisible_p (a, d) != 0);
- if (want != got)
- {
- printf ("mpz_divisible_p wrongn");
- printf (" expected %d got %dn", want, got);
- mpz_trace (" a", a);
- mpz_trace (" d", d);
- mp_trace_base = -16;
- mpz_trace (" a", a);
- mpz_trace (" d", d);
- abort ();
- }
- }
- void
- check_data (void)
- {
- static const struct {
- const char *a;
- const char *d;
- int want;
- } data[] = {
- { "0", "1", 1 },
- { "123", "1", 1 },
- { "-123", "1", 1 },
- { "0", "2", 1 },
- { "1", "2", 0 },
- { "2", "2", 1 },
- { "-2", "2", 1 },
- { "0x100000000000000000000000000000000", "2", 1 },
- { "0x100000000000000000000000000000001", "2", 0 },
- { "0x3333333333333333", "3", 1 },
- { "0x3333333333333332", "3", 0 },
- { "0x33333333333333333333333333333333", "3", 1 },
- { "0x33333333333333333333333333333332", "3", 0 },
- /* divisor changes from 2 to 1 limb after stripping 2s */
- { "0x3333333300000000", "0x180000000", 1 },
- { "0x33333333333333330000000000000000", "0x18000000000000000", 1 },
- { "0x133333333333333330000000000000000", "0x18000000000000000", 0 },
- };
- mpz_t a, d;
- int i;
- mpz_init (a);
- mpz_init (d);
- for (i = 0; i < numberof (data); i++)
- {
- mpz_set_str_or_abort (a, data[i].a, 0);
- mpz_set_str_or_abort (d, data[i].d, 0);
- check_one (a, d, data[i].want);
- }
- mpz_clear (a);
- mpz_clear (d);
- }
- void
- check_random (int reps)
- {
- gmp_randstate_ptr rands = RANDS;
- mpz_t a, d, r;
- int i;
- int want;
- mpz_init (a);
- mpz_init (d);
- mpz_init (r);
- for (i = 0; i < reps; i++)
- {
- mpz_erandomb (a, rands, 1 << 19);
- mpz_erandomb_nonzero (d, rands, 1 << 18);
- mpz_fdiv_r (r, a, d);
- want = (mpz_sgn (r) == 0);
- check_one (a, d, want);
- mpz_sub (a, a, r);
- check_one (a, d, 1);
- if (mpz_cmpabs_ui (d, 1L) == 0)
- continue;
- mpz_add_ui (a, a, 1L);
- check_one (a, d, 0);
- }
- mpz_clear (a);
- mpz_clear (d);
- mpz_clear (r);
- }
- int
- main (int argc, char *argv[])
- {
- int reps = 100;
- tests_start ();
- if (argc == 2)
- reps = atoi (argv[1]);
- check_data ();
- check_random (reps);
- tests_end ();
- exit (0);
- }