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/* Test of rounding to nearest, breaking ties away from zero.
Copyright (C) 2007-2008 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Ben Pfaff <blp@gnu.org>, 2007.
Based heavily on Bruno Haible's test-trunc.c. */
#include <config.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "isnand-nolibm.h"
#include "nan.h"
#define ASSERT(expr) \
do \
{ \
if (!(expr)) \
{ \
fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
fflush (stderr); \
abort (); \
} \
} \
while (0)
/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
So we use -zero instead. */
double zero = 0.0;
int
main ()
{
/* Zero. */
ASSERT (round (0.0) == 0.0);
ASSERT (round (-zero) == 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 (1.0 / 0.0) == 1.0 / 0.0);
ASSERT (round (-1.0 / 0.0) == -1.0 / 0.0);
/* NaNs. */
ASSERT (isnand (round (NaNd ())));
return 0;
}
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