81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/* Test mpz_get_d.
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Copyright 2002, 2012, 2020 Free Software Foundation, Inc.
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This file is part of the GNU MP Library test suite.
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The GNU MP Library test suite is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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The GNU MP Library test suite is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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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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the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "gmp-impl.h"
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#include "tests.h"
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void
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check_onebit (void)
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{
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int i;
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mpz_t z;
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double got, want;
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/* FIXME: It'd be better to base this on the float format. */
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#if defined (__vax) || defined (__vax__)
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int limit = 127 - 1; /* vax fp numbers have limited range */
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#else
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int limit = 512;
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#endif
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mpz_init (z);
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got = mpz_get_d (z);
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if (got != 0)
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{
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printf ("mpz_get_d wrong on zero\n");
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abort();
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}
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mpz_set_ui (z, 1L);
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want = 1.0;
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for (i = 0; i < limit; i++)
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{
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got = mpz_get_d (z);
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if (got != want)
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{
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printf ("mpz_get_d wrong on 2**%d\n", i);
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mpz_trace (" z ", z);
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printf (" want %.20g\n", want);
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printf (" got %.20g\n", got);
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abort();
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}
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mpz_mul_2exp (z, z, 1L);
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want *= 2.0;
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}
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mpz_clear (z);
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}
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int
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main (void)
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{
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tests_start ();
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check_onebit ();
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tests_end ();
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exit (0);
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}
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