Compute the complex hyperbolic cosine
#include <complex.h> double complex ccosh( double complex z ); float complex ccoshf( float complex z ); long double complex ccoshl( long double complex z );
These functions compute the complex hyperbolic cosine of z.
To check for error situations, use feclearexcept() and fetestexcept(). For example:
The complex hyperbolic cosine of z.
| If z is: | These functions return: | Errors: |
|---|---|---|
| 0 + 0i | 1 + 0i | — |
| 0 + Infi | NaN ± 0i, where the sign of the imaginary part is unspecified | FE_INVALID |
| 0 + NaNi | NaN ± 0i, where the sign of the imaginary part is unspecified | — |
| x + Infi, for any finite non-zero x | NaN - NaNi | FE_INVALID |
| x + NaNi, for any finite non-zero x | NaN + NaNi | — |
| Inf + 0i | Inf + 0i | — |
| Inf + yi, for any finite nonzero y | Inf + Inf * cis(y), where cis(y) is cos(y) + i sin(y) | — |
| Inf + Infi | ±Inf + NaNi, where the sign of the real part is unspecified | FE_INVALID |
| Inf + NaNi | Inf + NaNi | — |
| NaN + 0i | NaN ± 0i, where the sign of the imaginary part is unspecified | — |
| NaN + yi, for any finite 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 |