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 );
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.
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | No |
| Thread | Yes |