Секундомер

procedure TForm1.Button1Click(Sender: TObject);
begin
if button1.Caption='Старт' then button1.Caption:='Стоп' else button1.Caption:='Старт';
end;

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls;
 
type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Button1: TButton;
    Timer1: TTimer;            
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
  hour, min, sec: integer;
 
implementation
 
{$R *.dfm}  
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  hour:=0;
  min:=0;
  sec:=0;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
if Timer1.Enabled=False
then begin
  Timer1.Enabled:=True;
  Button1.Caption:='Ñòîï'
end else begin
  Timer1.Enabled:=False;
  Button1.Caption:='Ñòàðò'
end;
end;
 
procedure TForm1.Timer1Timer(Sender: TObject);
begin
sec:=sec+1;
if sec>=60 then begin
  sec:=0;
  min:=min+1
end;
if min>=60 then begin
  min:=0;
  hour:=hour+1
end;
 
Edit1.Text:=IntToStr(hour);
Edit2.Text:=IntToStr(min);
Edit3.Text:=IntToStr(sec);
end;
 
end.