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man:acoshl

ACOSH(3) Linux Programmer's Manual ACOSH(3)

NAME

     acosh, acoshf, acoshl - inverse hyperbolic cosine function

SYNOPSIS

     #include <math.h>
     double acosh(double x);
     float acoshf(float x);
     long double acoshl(long double x);
     Link with -lm.
 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
     acosh():
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
             || _XOPEN_SOURCE >= 500
             || /* Since glibc 2.19: */ _DEFAULT_SOURCE
             || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
     acoshf(), acoshl():
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
             || /* Since glibc 2.19: */ _DEFAULT_SOURCE
             || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

     These  functions  calculate the inverse hyperbolic cosine of x; that is
     the value whose hyperbolic cosine is x.

RETURN VALUE

     On success, these functions return the inverse hyperbolic cosine of  x.
     If x is a NaN, a NaN is returned.
     If x is +1, +0 is returned.
     If x is positive infinity, positive infinity is returned.
     If  x is less than 1, a domain error occurs, and the functions return a
     NaN.

ERRORS

     See math_error(7) for information on how to determine whether an  error
     has occurred when calling these functions.
     The following errors can occur:
     Domain error: x is less than 1
            errno  is  set  to  EDOM.   An  invalid floating-point exception
            (FE_INVALID) is raised.

ATTRIBUTES

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     allbox;  lbw28  lb  lb  l  l  l.  Interface Attribute Value T{ acosh(),
     acoshf(), acoshl() T}   Thread safety  MT-Safe

CONFORMING TO

     C99, POSIX.1-2001, POSIX.1-2008.
     The variant returning double also conforms to SVr4, 4.3BSD.

SEE ALSO

     asinh(3), atanh(3), cacosh(3), cosh(3), sinh(3), tanh(3)

COLOPHON

     This page is part of release 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                          ACOSH(3)
/data/webs/external/dokuwiki/data/pages/man/acoshl.txt · Last modified: 2019/05/17 09:32 by 127.0.0.1

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