NAME

cpow, cpowf, cpowl — complex power functions

SYNOPSIS

#include <complex.h>

double complex cpow(double complex x, double complex y);
float complex cpowf(float complex x, float complex y);
long double complex cpowl(long double complex x,
       long double complex y);


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 power function x^y, with a branch cut for the first parameter along the negative real axis.

^[MXC] These functions shall raise floating-point exceptions if appropriate for the calculation of the parts of the result, and may also raise spurious floating-point exceptions.

RETURN VALUE

These functions shall return the complex power function value.

ERRORS

No errors are defined.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

Permitting spurious floating-point exceptions allows cpow(z, c) to be implemented as cexp(cclog(z)) without precluding implementations that treat special cases more carefully.

FUTURE DIRECTIONS

None.

SEE ALSO

cabs, csqrt

XBD <complex.h>

CHANGE HISTORY

First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.

Issue 8

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