unit1.pas

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    edtByVar2: TEdit;
    btnByVar: TButton;
    edtByRef1: TEdit;
    edtByRef2: TEdit;
    btnByRef: TButton;
    edtByVar1: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Bevel1: TBevel;
    procedure btnByVarClick(Sender: TObject);
    procedure btnByRefClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

  TMyClass = class
    myvar:Integer;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.btnByVarClick(Sender: TObject);
var i,j:integer;
begin
  i:=24;
  j:=i;
  i:=i+1;
  edtByVar1.Text:=inttostr(i);
  edtByVar2.Text:=inttostr(j);
end;

procedure TForm1.btnByRefClick(Sender: TObject);
var a,b:TMyClass;
begin
  a:=TMyClass.Create;
  a.myvar:=24;
  b:=a;
  a.myvar:=a.myvar+1;
  edtByRef1.Text:=inttostr(a.myvar);
  edtByRef2.Text:=inttostr(b.myvar);
end;

end.