Function Arctan (X : Real) : Real;
Arctan returns the Arctangent of X, which can be any real type. The resulting angle is in radial units.
None
Program Example4;
{ Program to demonstrate the ArcTan function. }
Var R : Real;
begin
R:=ArcTan(0); { R:=0 }
R:=ArcTan(1)/pi; { R:=0.25 }
end.