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cosh(3posix)


NAME

   cosh, coshf, coshl --- hyperbolic cosine functions

SYNOPSIS

   #include <math.h>

   double cosh(double x);
   float coshf(float x);
   long double coshl(long double x);

DESCRIPTION

   The functionality described on this reference page is aligned with  the
   ISO C  standard.  Any  conflict between the requirements described here
   and the ISO C standard is unintentional. This  volume  of  POSIX.12008
   defers to the ISO C standard.

   These  functions  shall compute the hyperbolic cosine of their argument
   x.

   An application wishing to check for error situations should  set  errno
   to  zero  and  call  feclearexcept(FE_ALL_EXCEPT)  before calling these
   functions. On return, if errno is non-zero or fetestexcept(FE_INVALID |
   FE_DIVBYZERO  |  FE_OVERFLOW  | FE_UNDERFLOW) is non-zero, an error has
   occurred.

RETURN VALUE

   Upon successful completion, these functions shall return the hyperbolic
   cosine of x.

   If  the  correct  value would cause overflow, a range error shall occur
   and cosh(), coshf(), and coshl() shall return the value  of  the  macro
   HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.

   If x is NaN, a NaN shall be returned.

   If x is 0, the value 1.0 shall be returned.

   If x is Inf, +Inf shall be returned.

ERRORS

   These functions shall fail if:

   Range Error The result would cause an overflow.

               If  the  integer expression (math_errhandling & MATH_ERRNO)
               is non-zero, then errno shall be set to [ERANGE].   If  the
               integer  expression  (math_errhandling & MATH_ERREXCEPT) is
               non-zero, then the overflow floating-point exception  shall
               be raised.

   The following sections are informative.

EXAMPLES

   None.

APPLICATION USAGE

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

   For  IEEE Std 7541985  double,  710.5  <  |x| implies that cosh(x) has
   overflowed.

RATIONALE

   None.

FUTURE DIRECTIONS

   None.

SEE ALSO

   acosh(), feclearexcept(), fetestexcept(), isnan(), sinh(), tanh()

   The Base Definitions volume of POSIX.12008, Section 4.19, Treatment of
   Error Conditions for Mathematical Functions, <math.h>

COPYRIGHT

   Portions  of  this text are reprinted and reproduced in electronic form
   from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
   --  Portable  Operating  System  Interface (POSIX), The Open Group Base
   Specifications  Issue  7,  Copyright  (C)  2013  by  the  Institute  of
   Electrical and Electronics Engineers, Inc and The Open Group.  (This is
   POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
   event of any discrepancy between this version and the original IEEE and
   The Open Group Standard, the original IEEE and The Open Group  Standard
   is  the  referee document. The original Standard can be obtained online
   at http://www.unix.org/online.html .

   Any typographical or formatting errors that appear  in  this  page  are
   most likely to have been introduced during the conversion of the source
   files   to   man   page   format.   To   report   such   errors,    see
   https://www.kernel.org/doc/man-pages/reporting_bugs.html .



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