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ACOSH(3) | Linux Programmer's Manual | ACOSH(3) |
NAME¶
acosh, acoshf, acoshl - inverse hyperbolic cosine functionSYNOPSIS¶
#include <math.h> double acosh(double x);Link with -lm.
float acoshf(float x);
long double acoshl(long double x);
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).Interface | Attribute | Value |
acosh (), acoshf (), acoshl () | Thread safety | MT-Safe |
CONFORMING TO¶
C99, POSIX.1-2001, POSIX.1-2008.The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO¶
asinh(3), atanh(3), cacosh(3), cosh(3), sinh(3), tanh(3)COLOPHON¶
This page is part of release 4.10 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/.2016-03-15 |