1 /* Test of rounding towards zero.
2 Copyright (C) 2007 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 Bruno Haible <bruno@clisp.org>, 2007. */
27 #define ASSERT(expr) \
32 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
38 /* The Compaq (ex-DEC) C 6.4 compiler chokes on the expression 0.0 / 0.0. */
43 static double zero = 0.0;
47 # define NaN() (0.0 / 0.0)
54 ASSERT (trunc (0.0) == 0.0);
55 ASSERT (trunc (-0.0) == 0.0);
56 /* Positive numbers. */
57 ASSERT (trunc (0.3) == 0.0);
58 ASSERT (trunc (0.7) == 0.0);
59 ASSERT (trunc (1.0) == 1.0);
60 ASSERT (trunc (1.5) == 1.0);
61 ASSERT (trunc (1.999) == 1.0);
62 ASSERT (trunc (2.0) == 2.0);
63 ASSERT (trunc (65535.999) == 65535.0);
64 ASSERT (trunc (65536.0) == 65536.0);
65 ASSERT (trunc (2.341e31) == 2.341e31);
66 /* Negative numbers. */
67 ASSERT (trunc (-0.3) == 0.0);
68 ASSERT (trunc (-0.7) == 0.0);
69 ASSERT (trunc (-1.0) == -1.0);
70 ASSERT (trunc (-1.5) == -1.0);
71 ASSERT (trunc (-1.999) == -1.0);
72 ASSERT (trunc (-2.0) == -2.0);
73 ASSERT (trunc (-65535.999) == -65535.0);
74 ASSERT (trunc (-65536.0) == -65536.0);
75 ASSERT (trunc (-2.341e31) == -2.341e31);
76 /* Infinite numbers. */
77 ASSERT (trunc (1.0 / 0.0) == 1.0 / 0.0);
78 ASSERT (trunc (-1.0 / 0.0) == -1.0 / 0.0);
80 ASSERT (isnan (trunc (NaN ())));