/* Test file for mpfr_set_q.

Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
Contributed by the AriC and Caramel projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LESSER.  If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */

#include <stdio.h>
#include <stdlib.h>

#include "mpfr-test.h"

static void
check (long int n, long int d, mpfr_rnd_t rnd, const char *ys)
{
  mpq_t q;
  mpfr_t x, t;
  int inexact, compare;

  mpfr_init2 (x, 53);
  mpfr_init2 (t, mpfr_get_prec (x) + mp_bits_per_limb);
  mpq_init (q);
  mpq_set_si (q, n, d);
  inexact = mpfr_set_q (x, q, rnd);

  /* check values */
  if (mpfr_cmp_str1(x, ys))
    {
      printf ("Error for q=%ld/%ld and rnd=%s\n", n, d,
              mpfr_print_rnd_mode (rnd));
      printf ("correct result is %s, mpfr_set_q gives ", ys);
      mpfr_out_str(stdout, 10, 0, x, MPFR_RNDN);
      putchar('\n');
      exit (1);
    }

  /* check inexact flag */
  if (mpfr_mul_ui (t, x, (d < 0) ? (-d) : d, rnd))
    {
      printf ("t <- x * d should be exact\n");
      exit (1);
    }
  compare = mpfr_cmp_si (t, n);
  if (((inexact == 0) && (compare != 0)) ||
      ((inexact < 0) && (compare >= 0)) ||
      ((inexact > 0) && (compare <= 0)))
    {
      printf ("wrong inexact flag: expected %d, got %d\n", compare,
              inexact);
      exit (1);
    }

  mpfr_clear (x);
  mpfr_clear (t);
  mpq_clear (q);
}

static void
check0 (void)
{
  mpq_t y;
  mpfr_t x;
  int inexact;
  int r;

  /* Check for +0 */
  mpfr_init (x);
  mpq_init (y);
  mpq_set_si (y, 0, 1);
  for (r = 0; r < MPFR_RND_MAX; r++)
    {
      inexact = mpfr_set_q(x, y, (mpfr_rnd_t) r);
      if (!MPFR_IS_ZERO(x) || !MPFR_IS_POS(x) || inexact)
        {
          printf("mpfr_set_q(x,0) failed for %s\n",
                 mpfr_print_rnd_mode ((mpfr_rnd_t) r));
          exit(1);
        }
    }
  mpfr_clear (x);
  mpq_clear (y);
}

static void
check_nan_inf_mpq (void)
{
  mpfr_t mpfr_value, mpfr_cmp;
  mpq_t mpq_value;
  int status;

  mpfr_init2 (mpfr_value, MPFR_PREC_MIN);
  mpq_init (mpq_value);
  mpq_set_si (mpq_value, 0, 0);
  mpz_set_si (mpq_denref (mpq_value), 0);

  status = mpfr_set_q (mpfr_value, mpq_value, MPFR_RNDN);

  if ((status != 0) || (!MPFR_IS_NAN (mpfr_value)))
    {
      mpfr_init2 (mpfr_cmp, MPFR_PREC_MIN);
      mpfr_set_nan (mpfr_cmp);
      printf ("mpfr_set_q with a NAN mpq value returned a wrong value :\n"
              " waiting for ");
      mpfr_print_binary (mpfr_cmp);
      printf (" got ");
      mpfr_print_binary (mpfr_value);
      printf ("\n trinary value is %d\n", status);
      exit (1);
    }

  mpq_set_si (mpq_value, -1, 0);
  mpz_set_si (mpq_denref (mpq_value), 0);

  status = mpfr_set_q (mpfr_value, mpq_value, MPFR_RNDN);

  if ((status != 0) || (!MPFR_IS_INF (mpfr_value)) ||
      (MPFR_SIGN(mpfr_value) != mpq_sgn(mpq_value)))
    {
      mpfr_init2 (mpfr_cmp, MPFR_PREC_MIN);
      mpfr_set_inf (mpfr_cmp, -1);
      printf ("mpfr_set_q with a -INF mpq value returned a wrong value :\n"
              " waiting for ");
      mpfr_print_binary (mpfr_cmp);
      printf (" got ");
      mpfr_print_binary (mpfr_value);
      printf ("\n trinary value is %d\n", status);
      exit (1);
    }

  mpq_clear (mpq_value);
  mpfr_clear (mpfr_value);
}

int
main (void)
{
  tests_start_mpfr ();

  check(-1647229822, 40619231, MPFR_RNDZ, "-4.055295438754120596e1");
  check(-148939696, 1673285490, MPFR_RNDZ, "-8.9010331404953485501e-2");
  check(-441322590, 273662545, MPFR_RNDZ, "-1.6126525096812205362");
  check(-1631156895, 1677687197, MPFR_RNDU, "-9.722652100563177191e-1");
  check(2141332571, 3117601, MPFR_RNDZ, "6.8685267004982347316e2");
  check(75504803, 400207282, MPFR_RNDU, "1.8866424074712365155e-1");
  check(643562308, 23100894, MPFR_RNDD, "2.7858762002890447462e1");
  check(632549085, 1831935802, MPFR_RNDN, "3.4528998467600230393e-1");
  check (1, 1, MPFR_RNDN, "1.0");

  check0();

  check_nan_inf_mpq ();

  tests_end_mpfr ();
  return 0;
}
