1/* Test of <math.h> substitute.
2   Copyright (C) 2007, 2008, 2009, 2010 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 of the License, or
7   (at your option) 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 <http://www.gnu.org/licenses/>.  */
16
17/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
18
19#include <config.h>
20
21#include <math.h>
22
23#ifndef NAN
24# error NAN should be defined
25choke me
26#endif
27
28#if 0
29/* Check that NAN expands into a constant expression.  */
30static float n = NAN;
31#endif
32
33/* Compare two numbers with ==.
34   This is a separate function because IRIX 6.5 "cc -O" miscompiles an
35   'x == x' test.  */
36static int
37numeric_equal (double x, double y)
38{
39  return x == y;
40}
41
42int
43main (void)
44{
45  double d = NAN;
46  double zero = 0.0;
47  if (numeric_equal (d, d))
48    return 1;
49  d = HUGE_VAL;
50  if (!numeric_equal (d, 1.0 / zero))
51    return 1;
52  return 0;
53}
54