mpfr-2.4.1/tests/tset_q.c

/* Test file for mpfr_set_q.

Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao 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 2.1 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.LIB.  If not, 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, mp_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, GMP_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 < GMP_RND_MAX; r++)
    {
      inexact = mpfr_set_q(x, y, (mp_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 ((mp_rnd_t) r));
          exit(1);
        }
    }
  mpfr_clear (x);
  mpq_clear (y);
}

int
main (void)
{
  tests_start_mpfr ();

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

  check0();

  tests_end_mpfr ();
  return 0;
}