tests/test-round1.c

   1 /* Test of rounding to nearest, breaking ties away from zero.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Ben Pfaff <blp@gnu.org>, 2007.
  18    Based heavily on Bruno Haible's test-trunc.c. */
  19
  20 #include <config.h>
  21
  22 #include <math.h>
  23
  24 #include "signature.h"
  25 SIGNATURE_CHECK (round, double, (double));
  26
  27 #include "isnand-nolibm.h"
  28 #include "minus-zero.h"
  29 #include "infinity.h"
  30 #include "nan.h"
  31 #include "macros.h"
  32
  33 int
  34 main ()
  35 {
  36   /* Zero.  */
  37   ASSERT (round (0.0) == 0.0);
  38   ASSERT (round (minus_zerod) == 0.0);
  39   /* Positive numbers.  */
  40   ASSERT (round (0.3) == 0.0);
  41   ASSERT (round (0.5) == 1.0);
  42   ASSERT (round (0.7) == 1.0);
  43   ASSERT (round (1.0) == 1.0);
  44   ASSERT (round (1.5) == 2.0);
  45   ASSERT (round (2.5) == 3.0);
  46   ASSERT (round (1.999) == 2.0);
  47   ASSERT (round (2.0) == 2.0);
  48   ASSERT (round (65535.999) == 65536.0);
  49   ASSERT (round (65536.0) == 65536.0);
  50   ASSERT (round (65536.001) == 65536.0);
  51   ASSERT (round (2.341e31) == 2.341e31);
  52   /* Negative numbers.  */
  53   ASSERT (round (-0.3) == 0.0);
  54   ASSERT (round (-0.5) == -1.0);
  55   ASSERT (round (-0.7) == -1.0);
  56   ASSERT (round (-1.0) == -1.0);
  57   ASSERT (round (-1.5) == -2.0);
  58   ASSERT (round (-2.5) == -3.0);
  59   ASSERT (round (-1.999) == -2.0);
  60   ASSERT (round (-2.0) == -2.0);
  61   ASSERT (round (-65535.999) == -65536.0);
  62   ASSERT (round (-65536.0) == -65536.0);
  63   ASSERT (round (-65536.001) == -65536.0);
  64   ASSERT (round (-2.341e31) == -2.341e31);
  65   /* Infinite numbers.  */
  66   ASSERT (round (Infinityd ()) == Infinityd ());
  67   ASSERT (round (- Infinityd ()) == - Infinityd ());
  68   /* NaNs.  */
  69   ASSERT (isnand (round (NaNd ())));
  70
  71   return test_exit_status;
  72 }