NAME
ccosh ccoshf
ccoshl — complex hyperbolic
cosine functions
SYNOPSIS
#include
<complex.h>
double complex ccosh(double complex z); float complex ccoshf(float complex z); long double complex ccoshl(long double complex z);
DESCRIPTION
[CX] 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 cosine of z.
RETURN VALUE
These functions shall return the complex hyperbolic cosine value.
[MXC]
ccosh ( conj (
z)), ccoshf ( conjf (
z)), and ccoshl (
conjl ( z)) shall return exactly the
same value as conj ( ccosh (
z)), conjf ( ccoshf (
z)), and conjl (
ccoshl ( z)), respectively, and
ccosh ( -z),
ccoshf ( -z), and
ccoshl ( -z) shall return exactly the
same value as ccosh ( z),
ccoshf ( z), and
ccoshl ( z), respectively, including for
the special values of z below.
If z is +0 + i 0, 1 + i 0 shall be returned.
If z is +0 + i Inf, NaN ± i 0 shall be returned and the invalid floating-point exception shall be raised; the sign of the imaginary part of the result is unspecified.
If z is +0 + i NaN, NaN ± i 0 shall be returned; the sign of the imaginary part of the result is unspecified.
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 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 + i 0, +Inf + i 0 shall be returned.
If z is +Inf + iy where y is non-zero and finite, +Inf ( cos ( y) + isin ( y)) shall be returned.
If z is +Inf + i Inf, ±Inf + i NaN shall be returned and the invalid floating-point exception shall be raised; the sign of the real part of the result is unspecified.
If z is +Inf + i NaN, +Inf + i NaN shall be returned.
If z is NaN + i 0, NaN ± i 0 shall be returned; the sign of the imaginary part of the result is unspecified.
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.
ERRORS
No errors are defined.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
XBD <complex.h>
CHANGE HISTORY
First released in Issue 6. Derived from the ISO/IEC 9899:1999 (“ISO C99”) standard.
Issue 8
Austin Group Defect 1302 is applied, aligning these functions with the ISO/IEC 9899:2018 standard.