t-get_d.c
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上传日期:2022-08-06
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- /* Test mpz_get_d.
- Copyright 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"
- void
- check_onebit (void)
- {
- int i;
- mpz_t z;
- double got, want;
- /* FIXME: It'd be better to base this on the float format. */
- #ifdef __vax
- int limit = 127; /* vax fp numbers have limited range */
- #else
- int limit = 512;
- #endif
- mpz_init (z);
- mpz_set_ui (z, 1L);
- want = 1.0;
- for (i = 0; i < limit; i++)
- {
- got = mpz_get_d (z);
- if (got != want)
- {
- printf ("mpz_get_d wrong on 2**%dn", i);
- mpz_trace (" z ", z);
- printf (" want %.20gn", want);
- printf (" got %.20gn", got);
- abort();
- }
- mpz_mul_2exp (z, z, 1L);
- want *= 2.0;
- }
- mpz_clear (z);
- }
- int
- main (void)
- {
- tests_start ();
- check_onebit ();
- tests_end ();
- exit (0);
- }