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/* Test mpz_get_d.
Copyright 2002, 2012, 2020 Free Software Foundation, Inc.
This file is part of the GNU MP Library test suite.
The GNU MP Library test suite 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.
The GNU MP Library test suite 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
the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
#include <stdio.h>
#include <stdlib.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. */
#if defined (__vax) || defined (__vax__)
int limit = 127 - 1; /* vax fp numbers have limited range */
#else
int limit = 512;
#endif
mpz_init (z);
got = mpz_get_d (z);
if (got != 0)
{
printf ("mpz_get_d wrong on zero\n");
abort();
}
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**%d\n", i);
mpz_trace (" z ", z);
printf (" want %.20g\n", want);
printf (" got %.20g\n", 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);
}
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