c99 [ flag... ] file... –lm [ library... ] #include <math.h> double sinh(double x);
float sinhf(float x);
long double sinhl(long double x);
These functions compute the hyperbolic sine of x.
Upon successful completion, these functions return the hyperbolic sine of x.
If the result would cause an overflow, a range error occurs and ±HUGE_VAL, ±HUGE_VALF, and ±HUGE_VALL (with the same sign as x) is returned as appropriate for the type of the function.
If x is NaN, a NaN is returned.
If x is ±0 or ±Inf, x is returned.
For exceptional cases, matherr(3M) tabulates the values to be returned by acos() as specified by SVID3 and XPG3.
These functions will fail if:
The result would cause an overflow.
If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the overflow floating-point exception is raised.
The asinh() function sets errno to ERANGE if the result would cause an overflow.
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions.
An application can also set errno to 0 before calling asinh(). On return, if errno is non-zero, an error has occurred. The asinhf() and asinhl() functions do not set errno.
See attributes(5) for descriptions of the following attributes: