acoshl man page on Oracle

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ACOSH(3P)		   POSIX Programmer's Manual		     ACOSH(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       acosh, acoshf, acoshl - inverse hyperbolic cosine functions

       #include <math.h>

       double acosh(double x);
       float acoshf(float x);
       long double acoshl(long double x);

       These functions shall compute the inverse 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

       Upon  successful	 completion,  these functions shall return the inverse
       hyperbolic cosine of their argument.

       For finite values of x < 1, a domain error shall occur, and   either  a
       NaN  (if	 supported),  or  an  implementation-defined  value  shall  be

       If x is NaN, a NaN shall be returned.

       If x is +1, +0 shall be returned.

       If x is +Inf, +Inf shall be returned.

       If x is -Inf, a domain error shall occur, and either  a	NaN  (if  sup‐
       ported), or an implementation-defined value shall be returned.

       These functions shall fail if:

       Domain Error
	      The x argument is finite and less than +1.0,  or is -Inf.

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

       The following sections are informative.


       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.



       cosh(), feclearexcept(), fetestexcept(), the Base Definitions volume of
       IEEE Std 1003.1-2001,  Section  4.18, Treatment of Error Conditions for
       Mathematical Functions, <math.h>

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  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 .

IEEE/The Open Group		     2003			     ACOSH(3P)

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