Listbox - hviezdy, gen, cistenie

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    ListBox1: TListBox;
    Button2: TButton;
    Button3: TButton;
    procedure Button3Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure hviezdy;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button2Click(Sender: TObject);
begin
Edit1.Text:='';
Listbox1.Items.Clear;
end;

procedure TForm1.Button3Click(Sender: TObject);
var
i:integer;
begin
randomize;
for i := 1 to 10 do
  begin
    Listbox1.Items.Add(IntToStr(random(100)+1));
  end;

end;

procedure TForm1.hviezdy;
var
i:integer;
riadok:string;
begin
riadok:='';
for i := 1 to StrToInt(Edit1.Text) do
begin
  riadok:=riadok+'*';
  Listbox1.Items.Add(riadok);
end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
hviezdy;
end;

end.