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### Arg

#### Synopsis

    function Arg (z: Complex): Real;

#### Description

`Arg` returns the complex "argument", i.e. the angle (in radian) in the complex plane with respect to the real axis, of its parameter `z`. The result is in the range of `-Pi < Arg (z) <= Pi`.

#### Conforming to

`Arg` is an ISO 10206 Extended Pascal extension.

#### Example

    program ArgDemo;
    var
      z: Complex;
    begin
      z := Cmplx (1, 1);  { 1 + i }
      WriteLn (Arg (z) : 0 : 5)  { yields 0.78540, i.e. Pi / 4 }
    end.

#### See also

ArcTan, Ln, Polar.