System.ArcTan Function

Calculates the arctangent of a given number.

Pascal

function ArcTan(const X: Extended): Extended;

C++

Extended ArcTan(const Extended X);

File

System

Description

In Delphi code, ArcTan returns the arctangent of X.

X is a real-type expression that gives an angle in radians.

Delphi Examples:

Copy Code

{
This example shows how to use the ArcTan and FloatToStr
functions.
}
procedure TForm1.Button1Click(Sender: TObject);
var
  ex : Extended;
  mystring : String;
begin
  ex := 16 * ArcTan(1/5) - 4 * ArcTan(1/239); // Machin's formula
  mystring := FloatToStr(ex);
  Edit2.Text := mystring;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  ex : Extended;
  myString : String;
begin
  ex := Pi;
  mystring := FloatToStr(ex);
  Edit1.Text := mystring;
end;