Compute the argument of a complex number
#include <complex.h> double carg(double complex z); float cargf(float complex z); long double cargl(long double complex z);
These functions compute the argument (or phase angle) of the complex number specified by z, with a branch cut along the negative real axis.
To check for error situations, use feclearexcept() and fetestexcept(). For example:
If no errors occur, the argument of z, in the interval (-π; π).
Errors and special cases are handled as if the function were implemented as atan2 (cimag(z), creal(z)).
These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |