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1 | /* Return cosine of complex double value. */ |
2 | ||
3 | /* Copyright (C) 1997-1999 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of the GNU ISO C++ Library. This library is free | |
6 | software; you can redistribute it and/or modify it under the | |
7 | terms of the GNU General Public License as published by the | |
8 | Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | This library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License along | |
17 | with this library; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
19 | USA. | |
20 | ||
21 | As a special exception, you may use this file as part of a free software | |
22 | library without restriction. Specifically, if other files instantiate | |
23 | templates or use macros or inline functions from this file, or you compile | |
24 | this file and link it with other files to produce an executable, this | |
25 | file does not by itself cause the resulting executable to be covered by | |
26 | the GNU General Public License. This exception does not however | |
27 | invalidate any other reasons why the executable file might be covered by | |
28 | the GNU General Public License. */ | |
29 | ||
30 | ||
31 | #include <math.h> | |
32 | #include "mathconf.h" | |
33 | ||
34 | __complex__ double | |
35 | ccos (__complex__ double x) | |
36 | { | |
37 | __complex__ double res; | |
38 | ||
39 | if (!FINITE_P (__real__ x) || __imag__ x != __imag__ x) | |
40 | { | |
41 | if (__real__ x == 0.0 || __imag__ x == 0.0) | |
42 | { | |
43 | __real__ res = NAN; | |
44 | __imag__ res = 0.0; | |
45 | } | |
46 | else if (INFINITE_P (__imag__ x)) | |
47 | { | |
48 | __real__ res = HUGE_VAL; | |
49 | __imag__ res = NAN; | |
50 | } | |
51 | else | |
52 | { | |
53 | __real__ res = NAN; | |
54 | __imag__ res = NAN; | |
55 | } | |
56 | } | |
57 | else | |
58 | { | |
59 | __complex__ double y; | |
60 | ||
61 | __real__ y = -__imag__ x; | |
62 | __imag__ y = __real__ x; | |
63 | ||
64 | res = ccosh (y); | |
65 | } | |
66 | ||
67 | return res; | |
68 | } |