[fmtidona]

Este codigo me da error al compilarlo en la parte de la declaracion de la funcion, que estoy haciendo mal? gracias

Código Delphi [-]
unit aprendiendo;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    function mul(x:integer):integer;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function mul(x:integer):integer;
begin
  mul:=(x*x);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  a:integer;
begin

   a:=mul(3);
   label1.Caption:=inttostr(a);

end;

end.