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/* Test of rounding to nearest, breaking ties away from zero.
   Copyright (C) 2007-2025 Free Software Foundation, Inc.

   This program 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, or (at your option)
   any later version.

   This program 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 this program; if not, see <https://www.gnu.org/licenses/>.  */

/* Written by Ben Pfaff <blp@gnu.org>, 2007.
   Based heavily on Bruno Haible's test-trunc.c. */

#include <config.h>

#include <math.h>

#include "signature.h"
SIGNATURE_CHECK (round, double, (double));

#include "isnand-nolibm.h"
#include "minus-zero.h"
#include "infinity.h"
#include "nan.h"
#include "macros.h"

int
main ()
{
  /* Zero.  */
  ASSERT (round (0.0) == 0.0);
  ASSERT (round (minus_zerod) == 0.0);
  /* Positive numbers.  */
  ASSERT (round (0.3) == 0.0);
  ASSERT (round (0.5) == 1.0);
  ASSERT (round (0.7) == 1.0);
  ASSERT (round (1.0) == 1.0);
  ASSERT (round (1.5) == 2.0);
  ASSERT (round (2.5) == 3.0);
  ASSERT (round (1.999) == 2.0);
  ASSERT (round (2.0) == 2.0);
  ASSERT (round (65535.999) == 65536.0);
  ASSERT (round (65536.0) == 65536.0);
  ASSERT (round (65536.001) == 65536.0);
  ASSERT (round (2.341e31) == 2.341e31);
  /* Negative numbers.  */
  ASSERT (round (-0.3) == 0.0);
  ASSERT (round (-0.5) == -1.0);
  ASSERT (round (-0.7) == -1.0);
  ASSERT (round (-1.0) == -1.0);
  ASSERT (round (-1.5) == -2.0);
  ASSERT (round (-2.5) == -3.0);
  ASSERT (round (-1.999) == -2.0);
  ASSERT (round (-2.0) == -2.0);
  ASSERT (round (-65535.999) == -65536.0);
  ASSERT (round (-65536.0) == -65536.0);
  ASSERT (round (-65536.001) == -65536.0);
  ASSERT (round (-2.341e31) == -2.341e31);
  /* Infinite numbers.  */
  ASSERT (round (Infinityd ()) == Infinityd ());
  ASSERT (round (- Infinityd ()) == - Infinityd ());
  /* NaNs.  */
  ASSERT (isnand (round (NaNd ())));

  return test_exit_status;
}
kc3-lang/gnulib/tests/test-round1.c

Commit

tests/test-round1.c
