Calculates the argument.
[Format]
#include <complex.h>
float cargf(float complex z);
double carg(double complex z);
long double cargl(long double complex z);
[Parameters]
z Complex number for which the argument is to be computed
[Return values]
Argument value of z
[Remarks]
The branch cut for the carg function group is along the negative real axis.
The carg function group returns the argument in the range [–π, +π].