1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/* Copyright 2011, 2012 Kevin Ryde
This file is part of Math-PlanePath.
Math-PlanePath 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.
Math-PlanePath 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 Math-PlanePath. If not, see <http://www.gnu.org/licenses/>.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
void
dump (double d)
{
union { double d; unsigned char byte[8]; } u;
u.d = d;
printf ("%02X %02X %02X %02X %02X %02X %02X %02X\n",
u.byte[0], u.byte[1], u.byte[2], u.byte[3],
u.byte[4], u.byte[5], u.byte[6], u.byte[7]);
}
static const double double_ulong_max_plus_1
= ((double) ((ULONG_MAX >> 1)+1)) * 2.0;
static const double double_ull_max_plus_1
= ((double) ((ULLONG_MAX >> 1)+1)) * 2.0;
int
main (void)
{
volatile double zero = 0;
volatile double negzero = -zero;
dump (zero);
dump (negzero);
printf ("%la %la\n", zero,negzero);
printf ("%la\n", atan2(zero,zero));
printf ("%la\n", atan2(negzero,zero));
printf ("\n");
printf ("%la\n", atan2(zero,negzero));
printf ("%la\n", atan2(negzero,negzero));
printf ("\n");
printf ("ulong %la ", double_ulong_max_plus_1);
dump (double_ulong_max_plus_1);
printf (" %lf\n", double_ulong_max_plus_1);
printf ("ull %la ", double_ull_max_plus_1);
dump (double_ull_max_plus_1);
printf (" %lf\n", double_ull_max_plus_1);
exit (0);
}
|
