1 /* Return cosine of complex double value.
2 Copyright (C) 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C 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 GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include "math_private.h"
27 __ccos (__complex__ double x)
29 __complex__ double res;
31 if (!isfinite (__real__ x) || __isnan (__imag__ x))
33 if (__real__ x == 0.0 || __imag__ x == 0.0)
35 __real__ res = __nan ("");
39 if (__isinf (__real__ x))
40 feraiseexcept (FE_INVALID);
43 else if (__isinf (__imag__ x))
45 __real__ res = HUGE_VAL;
46 __imag__ res = __nan ("");
49 if (__isinf (__real__ x))
50 feraiseexcept (FE_INVALID);
55 __real__ res = __nan ("");
56 __imag__ res = __nan ("");
59 if (isfinite (__imag__ x))
60 feraiseexcept (FE_INVALID);
68 __real__ y = -__imag__ x;
69 __imag__ y = __real__ x;
76 weak_alias (__ccos, ccos)
78 strong_alias (__ccos, __ccosl)
79 weak_alias (__ccos, ccosl)