Интерактивная система просмотра системных руководств (man-ов) acoshl (3) acoshl ( Русские man: Библиотечные вызовы ) >> acoshl ( Linux man: Библиотечные вызовы ) acoshl ( POSIX man: Библиотечные вызовы )
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
acosh ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or
cc -std=c99
acoshf (),
acoshl ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or
cc -std=c99
DESCRIPTION
The
acosh ()
function calculates 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
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.
CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD, C89.
SEE ALSO
asinh atanh cacosh cosh sinh tanh
COLOPHON
This page is part of release 3.14 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO
COLOPHON
