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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* Test file for mpfr_asin.
Copyright 2001, 2002 Free Software Foundation.
Original version by Mathieu Dutour.
This file is part of the MPFR Library.
The MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
The MPFR Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "gmp.h"
#include "mpfr.h"
#include "mpfr-test.h"
int
main (void)
{
unsigned int prec, err, yprec, n;
mp_rnd_t rnd;
mpfr_t x, y, z;
tests_start_mpfr ();
mpfr_init (x);
mpfr_init (y);
mpfr_init (z);
/* check that sin(-1) = -Pi/2 */
mpfr_set_si (x, -1, GMP_RNDN);
mpfr_asin (y, x, GMP_RNDN);
mpfr_const_pi (z, GMP_RNDN);
mpfr_div_2exp (z, z, 1, GMP_RNDN);
mpfr_neg (z, z, GMP_RNDN);
if (mpfr_cmp (y, z))
{
fprintf (stderr, "sin(-1) is wrong, expected %.20e, got %.20e\n",
mpfr_get_d1 (z), mpfr_get_d1 (y));
exit (1);
}
for (prec = 2; prec <= 100; prec++)
{
mpfr_set_prec (x, prec);
mpfr_set_prec (z, prec);
yprec = prec + 10;
for (n = 0; n < 10; n++)
{
mpfr_random (x);
rnd = random () % 4;
mpfr_set_prec (y, yprec);
mpfr_asin (y, x, rnd);
err = (rnd == GMP_RNDN) ? yprec + 1 : yprec;
if (mpfr_can_round (y, err, rnd, rnd, prec))
{
mpfr_round_prec (y, rnd, prec);
mpfr_asin (z, x, rnd);
if (mpfr_cmp (y, z))
{
printf ("results differ for x=");
mpfr_out_str (stdout, 2, prec, x, GMP_RNDN);
printf (" prec=%u rnd_mode=%s\n", prec,
mpfr_print_rnd_mode (rnd));
printf (" got ");
mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
putchar ('\n');
printf (" expected ");
mpfr_out_str (stdout, 2, prec, y, GMP_RNDN);
putchar ('\n');
}
}
}
}
mpfr_clear (x);
mpfr_clear (y);
mpfr_clear (z);
tests_end_mpfr ();
return 0;
}
|
