/* Test mpz_get_d.

Copyright 2002, 2012 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.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);

  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);

}