#include <math.h> double asinh(double x); float asinhf(float x); long double asinhl(long double x);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
asinh():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 500 || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
asinhf(), asinhl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
If x is a NaN, a NaN is returned.
If x is +0 (-0), +0 (-0) is returned.
If x is positive infinity (negative infinity), positive infinity (negative infinity) is returned.
Interface | Attribute | Value |
asinh(), asinhf(), asinhl() | Thread safety | MT-Safe |
The variant returning double also conforms to SVr4, 4.3BSD.