unit ThrdU;

interface

uses
Classes;

type
TTestThread = class(TThread)
private
Answer: integer;
protected
procedure GiveAnswer;
procedure Execute; override;
end;

implementation

uses SysUtils, Main;

{ TTestThread }

procedure TTestThread.GiveAnswer;
begin
MainForm.Edit1.Text := InttoStr(Answer);
end;

procedure TTestThread.Execute;
var
I: Integer;
begin
FreeOnTerminate := True;
for I := 1 to 2000000 do
begin
if Terminated then
Break;
Inc(Answer, Round(Abs(Sin(Sqrt(I)))));
Synchronize(GiveAnswer);
end;
end;

end.
unit Main;

interface

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

type
TMainForm = class(TForm)
Edit1: TEdit;
Button1: TButton;
Memo1: TMemo;
Label1: TLabel;
Label2: TLabel;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
MainForm: TMainForm;

implementation

{$R *.DFM}

procedure TMainForm.Button1Click(Sender: TObject);
begin
TTestThread.Create(False);
end;

end.