ctanh(), ctanhf(), ctanhl()

Updated: October 26, 2022

Compute the complex hyperbolic tangent


#include <complex.h>

double complex ctanh( double complex z );

float complex ctanhf( float complex z );

long double complex ctanhl( long double complex z );


The value that you want to get the complex hyperbolic tangent of.


The general-purpose math library.
(QNX Neutrino 7.1 or later) A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

Note: Compile your program with the -fno-builtin option to prevent the compiler from using a built-in version of the function.


These functions compute the complex hyperbolic tangent of the number specified by z.

To check for error situations, use feclearexcept() and fetestexcept(). For example:


The complex hyperbolic tangent of z.

If z is: These functions return: Errors:
0 + 0i 0 + 0i
0 + Infi 0 + NaNi FE_INVALID
x + Infi, for any nonzero, finite x NaN + NaNi FE_INVALID
0 + NaNi 0 + NaNi
x + NaNi, for any nonzero finite x NaN + NaNi
Inf + yi, for any finite positive y 1 + 0i
Inf + Infi 1 ± 0i, where the sign of the imaginary part is unspecified
Inf + NaNi 1 ± 0i, where the sign of the imaginary part is unspecified
NaN + 0i NaN + 0i
NaN + yi, for any nonzero y NaN + NaNi
NaN + NaNi NaN + NaNi

These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.


C11, POSIX 1003.1

Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes