/* Test file for mpfr_set.

Copyright 2001, 2002, 2003, 2004, 2005 Free Software Foundation.

This file is part of the MPFR Library.

The 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 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 MPFR Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

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

#include "mpfr-test.h"

/* Maybe better create its own test file ? */
static void
check_neg_special ()
{
  mpfr_t x;
  mpfr_init (x);
  MPFR_SET_NAN (x);
  mpfr_clear_nanflag ();
  mpfr_neg (x, x, GMP_RNDN);
  if (!mpfr_nanflag_p () )
    {
      printf("ERROR: neg (NaN) doesn't set Nan flag.\n");
      exit (1);
    }
  mpfr_clear (x);
}

int
main (void)
{
  mp_prec_t p, q;
  mpfr_t x, y, z, u;
  int rnd;
  int inexact, cmp;
  mp_exp_t emax;

  tests_start_mpfr ();

  /* check prototypes of mpfr_init_set_* */
  inexact = mpfr_init_set_si (x, -1, GMP_RNDN);
  inexact = mpfr_init_set (y, x, GMP_RNDN);
  inexact = mpfr_init_set_ui (z, 1, GMP_RNDN);
  inexact = mpfr_init_set_d (u, 1.0, GMP_RNDN);

  mpfr_set_nan (x);
  (mpfr_set) (y, x, GMP_RNDN);
  MPFR_ASSERTN(mpfr_nan_p (y));

  mpfr_set_inf (x, 1);
  mpfr_set (y, x, GMP_RNDN);
  MPFR_ASSERTN(mpfr_inf_p (y) && mpfr_sgn (y) > 0);

  mpfr_set_inf (x, -1);
  mpfr_set (y, x, GMP_RNDN);
  MPFR_ASSERTN(mpfr_inf_p (y) && mpfr_sgn (y) < 0);

  mpfr_set_ui (x, 0, GMP_RNDN);
  mpfr_set (y, x, GMP_RNDN);
  MPFR_ASSERTN(mpfr_cmp_ui (y, 0) == 0 && MPFR_IS_POS(y));

  mpfr_set_ui (x, 0, GMP_RNDN);
  mpfr_neg (x, x, GMP_RNDN);
  mpfr_set (y, x, GMP_RNDN);
  MPFR_ASSERTN(mpfr_cmp_ui (y, 0) == 0 && MPFR_IS_NEG(y));

  emax = mpfr_get_emax ();
  set_emax (0);
  mpfr_set_prec (x, 3);
  mpfr_set_str_binary (x, "0.111");
  mpfr_set_prec (y, 2);
  mpfr_set (y, x, GMP_RNDU);
  if (!(MPFR_IS_INF (y) && MPFR_SIGN (y) > 0))
    {
      printf ("Error for y=x=0.111 with px=3, py=2 and emax=0\nx=");
      mpfr_dump (x);
      printf ("y=");
      mpfr_dump (y);
      exit (1);
    }

  MPFR_ASSERTN (MPFR_IS_INF (y) && MPFR_SIGN (y) > 0);
  set_emax (emax);

  mpfr_set_prec (y, 11);
  mpfr_set_str_binary (y, "0.11111111100E-8");
  mpfr_set_prec (x, 2);
  mpfr_set (x, y, GMP_RNDN);
  mpfr_set_str_binary (y, "1.0E-8");
  if (mpfr_cmp (x, y))
    {
      printf ("Error for y=0.11111111100E-8, prec=2, rnd=GMP_RNDN\n");
      exit (1);
    }

  for (p=2; p<500; p++)
    {
      mpfr_set_prec (x, p);
      mpfr_random (x);
      if (randlimb () % 2)
	mpfr_neg (x, x, GMP_RNDN);
      for (q=2; q<2*p; q++)
        {
          mpfr_set_prec (y, q);
          for (rnd = 0; rnd < GMP_RND_MAX; rnd++)
            {
              inexact = mpfr_set (y, x, (mp_rnd_t) rnd);
              cmp = mpfr_cmp (y, x);
              if (((inexact == 0) && (cmp != 0)) ||
                  ((inexact > 0) && (cmp <= 0)) ||
                  ((inexact < 0) && (cmp >= 0)))
                {
                  printf ("Wrong inexact flag in mpfr_set: expected %d,"
                          " got %d\n", cmp, inexact);
                  exit (1);
                }
            }
        }
    }

  mpfr_clear (x);
  mpfr_clear (y);
  mpfr_clear (z);
  mpfr_clear (u);

  check_neg_special ();

  tests_end_mpfr ();
  return 0;
}