1 /* Test of rounding to nearest, breaking ties away from zero.
2 Copyright (C) 2007-2008 Free Software Foundation, Inc.
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 2, or (at your option)
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.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Ben Pfaff <blp@gnu.org>, 2007.
19 Based heavily on Bruno Haible's test-trunc.c. */
30 #define ASSERT(expr) \
35 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
41 /* The Compaq (ex-DEC) C 6.4 compiler chokes on the expression 0.0 / 0.0. */
46 static double zero = 0.0;
50 # define NaN() (0.0 / 0.0)
57 ASSERT (round (0.0) == 0.0);
58 ASSERT (round (-0.0) == 0.0);
59 /* Positive numbers. */
60 ASSERT (round (0.3) == 0.0);
61 ASSERT (round (0.5) == 1.0);
62 ASSERT (round (0.7) == 1.0);
63 ASSERT (round (1.0) == 1.0);
64 ASSERT (round (1.5) == 2.0);
65 ASSERT (round (2.5) == 3.0);
66 ASSERT (round (1.999) == 2.0);
67 ASSERT (round (2.0) == 2.0);
68 ASSERT (round (65535.999) == 65536.0);
69 ASSERT (round (65536.0) == 65536.0);
70 ASSERT (round (65536.001) == 65536.0);
71 ASSERT (round (2.341e31) == 2.341e31);
72 /* Negative numbers. */
73 ASSERT (round (-0.3) == 0.0);
74 ASSERT (round (-0.5) == -1.0);
75 ASSERT (round (-0.7) == -1.0);
76 ASSERT (round (-1.0) == -1.0);
77 ASSERT (round (-1.5) == -2.0);
78 ASSERT (round (-2.5) == -3.0);
79 ASSERT (round (-1.999) == -2.0);
80 ASSERT (round (-2.0) == -2.0);
81 ASSERT (round (-65535.999) == -65536.0);
82 ASSERT (round (-65536.0) == -65536.0);
83 ASSERT (round (-65536.001) == -65536.0);
84 ASSERT (round (-2.341e31) == -2.341e31);
85 /* Infinite numbers. */
86 ASSERT (round (1.0 / 0.0) == 1.0 / 0.0);
87 ASSERT (round (-1.0 / 0.0) == -1.0 / 0.0);
89 ASSERT (isnand (round (NaN ())));