cargf, carg, cargl

From cppreference.com
Defined in header <complex.h>
float       cargf( float complex z );
(since C99)
double      carg( double complex z );
(since C99)
long double cargl( long double complex z );
(since C99)

Computes the argument (also called phase angle) of z, with a branch cut along the negative real axis.

[edit] Parameters

z - complex argument

[edit] Return value

The argument of z in the interval (−π; π).

[edit] Example