CTANH(3) Library Functions Manual CTANH(3)

ctanh ctanhf ctanhl — complex hyperbolic tangent functions

#include <complex.h>

double complex ctanh(double complex z);
float complex ctanhf(float complex z);
long double complex ctanhl(long double complex z);

The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.

These functions shall compute the complex hyperbolic tangent of z.

These functions shall return the complex hyperbolic tangent value.

ctanh ( conj ( z)), ctanhf ( conjf ( z)), and ctanhl ( conjl ( z)) shall return exactly the same value as conj ( ctanh ( z)), conjf ( z )), and conjl ( ctanhl ( z)), respectively, and ctanh ( -z), ctanhf ( -z), and ctanhl ( -z) shall return exactly the same value as ( z), -ctanhf ( z), and -ctanhl ( z), respectively, including for the special values of z below.

If z is +0 + i 0, +0 + i 0 shall be returned.

If z is 0 + i Inf, 0 + i NaN shall be returned and the invalid floating-point exception shall be raised.

If z is x + i Inf where x is non-zero and finite, NaN + i NaN shall be returned and the invalid floating-point exception shall be raised.

If z is 0 + i NaN, 0 + i NaN shall be returned.

If z is x + i NaN where x is non-zero and finite, NaN + i NaN shall be returned and the invalid floating-point exception may be raised.

If z is +Inf + iy where y is positive-signed and finite, 1 + i 0 (2 y) shall be returned.

If z is +Inf + i Inf, 1 ± i 0 shall be returned; the sign of the imaginary part of the result is unspecified.

If z is +Inf + i NaN, 1 ± i 0 shall be returned; the sign of the imaginary part of the result is unspecified.

If z is NaN + i 0, NaN + i 0 shall be returned.

If z is NaN + iy where y is any non-zero number, NaN + i NaN shall be returned and the invalid floating-point exception may be raised.

If z is NaN + i NaN, NaN + i NaN shall be returned.

No errors are defined.

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None.

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catanh(3)

XBD <complex.h>

First released in Issue 6. Derived from the ISO/IEC 9899:1999 (“ISO C99”) standard.

Austin Group Defect 1302 is applied, aligning these functions with the ISO/IEC 9899:2018 standard.

June 14, 2024 posix.fail