1COSH(3P)                   POSIX Programmer's Manual                  COSH(3P)
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PROLOG

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.
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NAME

12       cosh, coshf, coshl — hyperbolic cosine functions
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SYNOPSIS

15       #include <math.h>
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17       double cosh(double x);
18       float coshf(float x);
19       long double coshl(long double x);
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DESCRIPTION

22       The functionality described on this reference page is aligned with  the
23       ISO C  standard.  Any  conflict between the requirements described here
24       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
25       defers to the ISO C standard.
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27       These  functions  shall compute the hyperbolic cosine of their argument
28       x.
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30       An application wishing to check for error situations should  set  errno
31       to  zero  and  call  feclearexcept(FE_ALL_EXCEPT)  before calling these
32       functions. On return, if errno is non-zero or fetestexcept(FE_INVALID |
33       FE_DIVBYZERO  |  FE_OVERFLOW  | FE_UNDERFLOW) is non-zero, an error has
34       occurred.
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RETURN VALUE

37       Upon successful completion, these functions shall return the hyperbolic
38       cosine of x.
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40       If  the  correct  value would cause overflow, a range error shall occur
41       and cosh(), coshf(), and coshl() shall return the value  of  the  macro
42       HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.
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44       If x is NaN, a NaN shall be returned.
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46       If x is ±0, the value 1.0 shall be returned.
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48       If x is ±Inf, +Inf shall be returned.
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ERRORS

51       These functions shall fail if:
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53       Range Error The result would cause an overflow.
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55                   If  the  integer expression (math_errhandling & MATH_ERRNO)
56                   is non-zero, then errno shall be set to [ERANGE].   If  the
57                   integer  expression  (math_errhandling & MATH_ERREXCEPT) is
58                   non-zero, then the overflow floating-point exception  shall
59                   be raised.
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61       The following sections are informative.
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EXAMPLES

64       None.
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APPLICATION USAGE

67       On   error,   the   expressions  (math_errhandling  &  MATH_ERRNO)  and
68       (math_errhandling & MATH_ERREXCEPT) are independent of each other,  but
69       at least one of them must be non-zero.
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RATIONALE

72       None.
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FUTURE DIRECTIONS

75       None.
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SEE ALSO

78       acosh(), feclearexcept(), fetestexcept(), isnan(), sinh(), tanh()
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80       The Base Definitions volume of POSIX.1‐2017, Section 4.20, Treatment of
81       Error Conditions for Mathematical Functions, <math.h>
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84       Portions of this text are reprinted and reproduced in  electronic  form
85       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
86       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
87       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
88       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
89       event of any discrepancy between this version and the original IEEE and
90       The Open Group Standard, the original IEEE and The Open Group  Standard
91       is  the  referee document. The original Standard can be obtained online
92       at http://www.opengroup.org/unix/online.html .
93
94       Any typographical or formatting errors that appear  in  this  page  are
95       most likely to have been introduced during the conversion of the source
96       files to man page format. To report such errors,  see  https://www.ker‐
97       nel.org/doc/man-pages/reporting_bugs.html .
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101IEEE/The Open Group                  2017                             COSH(3P)
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