src/mpfr-3.1.4/tests/tcmp_d.c

/* Test file for mpfr_cmp_d.

Copyright 1999, 2001-2004, 2006-2016 Free Software Foundation, Inc.
Contributed by the AriC and Caramba 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"

int
main (void)
{
  mpfr_t x;
  mpfr_exp_t emin;

  tests_start_mpfr ();
  emin = mpfr_get_emin ();

  mpfr_init2(x, IEEE_DBL_MANT_DIG);

  mpfr_set_d (x, 2.34763465, MPFR_RNDN);
  if (mpfr_cmp_d(x, 2.34763465)!=0) {
    printf("Error in mpfr_cmp_d 2.34763465 and ");
    mpfr_out_str(stdout, 10, 0, x, MPFR_RNDN); putchar('\n');
    exit(1);
  }
  if (mpfr_cmp_d(x, 2.345)<=0) {
    printf("Error in mpfr_cmp_d 2.345 and ");
    mpfr_out_str(stdout, 10, 0, x, MPFR_RNDN); putchar('\n');
    exit(1);
  }
  if (mpfr_cmp_d(x, 2.4)>=0) {
    printf("Error in mpfr_cmp_d 2.4 and ");
    mpfr_out_str(stdout, 10, 0, x, MPFR_RNDN); putchar('\n');
    exit(1);
  }

  mpfr_set_ui (x, 0, MPFR_RNDZ);
  mpfr_neg (x, x, MPFR_RNDZ);
  if (mpfr_cmp_d (x, 0.0)) {
    printf("Error in mpfr_cmp_d 0.0 and ");
    mpfr_out_str(stdout, 10, 0, x, MPFR_RNDN); putchar('\n');
    exit(1);
  }

  mpfr_set_ui (x, 0, MPFR_RNDN);
  mpfr_ui_div (x, 1, x, MPFR_RNDU);
  if (mpfr_cmp_d (x, 0.0) == 0)
    {
      printf ("Error in mpfr_cmp_d (Inf, 0)\n");
      exit (1);
    }

  /* Test in reduced exponent range. */
  set_emin (1);
  mpfr_set_ui (x, 1, MPFR_RNDN);
  if (mpfr_cmp_d (x, 0.9) <= 0)
    {
      printf ("Error in reduced exponent range.\n");
      exit (1);
    }
  set_emin (emin);

#if !defined(MPFR_ERRDIVZERO)
  /* Check NAN */
  {
    int c;

    mpfr_clear_flags ();
    c = mpfr_cmp_d (x, DBL_NAN);
    if (c != 0 || __gmpfr_flags != MPFR_FLAGS_ERANGE)
      {
        printf ("ERROR for NAN (1)\n");
        printf ("Expected 0, got %d\n", c);
        printf ("Expected flags:");
        flags_out (MPFR_FLAGS_ERANGE);
        printf ("Got flags:     ");
        flags_out (__gmpfr_flags);
#ifdef MPFR_NANISNAN
        printf ("The reason is that NAN == NAN. Please look at the configure "
                "output\nand Section \"In case of problem\" of the INSTALL "
                "file.\n");
#endif
        exit (1);
      }

    mpfr_set_nan (x);
    mpfr_clear_flags ();
    c = mpfr_cmp_d (x, 2.0);
    if (c != 0 || __gmpfr_flags != MPFR_FLAGS_ERANGE)
      {
        printf ("ERROR for NAN (2)\n");
        printf ("Expected 0, got %d\n", c);
        printf ("Expected flags:");
        flags_out (MPFR_FLAGS_ERANGE);
        printf ("Got flags:     ");
        flags_out (__gmpfr_flags);
#ifdef MPFR_NANISNAN
        printf ("The reason is that NAN == NAN. Please look at the configure "
                "output\nand Section \"In case of problem\" of the INSTALL "
                "file.\n");
#endif
        exit (1);
      }
  }
#endif  /* MPFR_ERRDIVZERO */

  mpfr_clear(x);

  tests_end_mpfr ();
  return 0;
}