1COSH(3P) POSIX Programmer's Manual COSH(3P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
13 cosh, coshf, coshl — hyperbolic cosine functions
14
16 #include <math.h>
17 double cosh(double x);
19 float coshf(float x);
20 long double coshl(long double x);
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23 The functionality described on this reference page is aligned with the
24 ISO C standard. Any conflict between the requirements described here
25 and the ISO C standard is unintentional. This volume of POSIX.1‐2008
26 defers to the ISO C standard.
27 These functions shall compute the hyperbolic cosine of their argument
29 x.
30 An application wishing to check for error situations should set errno
32 to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these
33 functions. On return, if errno is non-zero or fetestexcept(FE_INVALID |
34 FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has
35 occurred.
36
38 Upon successful completion, these functions shall return the hyperbolic
39 cosine of x.
40 If the correct value would cause overflow, a range error shall occur
42 and cosh(), coshf(), and coshl() shall return the value of the macro
43 HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.
44 If x is NaN, a NaN shall be returned.
46 If x is ±0, the value 1.0 shall be returned.
48 If x is ±Inf, +Inf shall be returned.
50
52 These functions shall fail if:
53 Range Error The result would cause an overflow.
55 If the integer expression (math_errhandling & MATH_ERRNO)
57 is non-zero, then errno shall be set to [ERANGE]. If the
58 integer expression (math_errhandling & MATH_ERREXCEPT) is
59 non-zero, then the overflow floating-point exception shall
60 be raised.
61 The following sections are informative.
63
65 None.
66
68 On error, the expressions (math_errhandling & MATH_ERRNO) and
69 (math_errhandling & MATH_ERREXCEPT) are independent of each other, but
70 at least one of them must be non-zero.
71 For IEEE Std 754‐1985 double, 710.5 < |x| implies that cosh(x) has
73 overflowed.
74
76 None.
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79 None.
80
82 acosh(), feclearexcept(), fetestexcept(), isnan(), sinh(), tanh()
83 The Base Definitions volume of POSIX.1‐2008, Section 4.19, Treatment of
85 Error Conditions for Mathematical Functions, <math.h>
86
88 Portions of this text are reprinted and reproduced in electronic form
89 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
90 -- Portable Operating System Interface (POSIX), The Open Group Base
91 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
92 cal and Electronics Engineers, Inc and The Open Group. (This is
93 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
94 event of any discrepancy between this version and the original IEEE and
95 The Open Group Standard, the original IEEE and The Open Group Standard
96 is the referee document. The original Standard can be obtained online
97 at http://www.unix.org/online.html .
98 Any typographical or formatting errors that appear in this page are
100 most likely to have been introduced during the conversion of the source
101 files to man page format. To report such errors, see https://www.ker‐
102 nel.org/doc/man-pages/reporting_bugs.html .
103IEEE/The Open Group 2013 COSH(3P)