unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);

  private
    { Private declarations }
  public

    { Public declarations }
  end;

var
  Form1: TForm1;
  var1 : string;





implementation

{$R *.dfm}



procedure TForm1.Button1Click(Sender: TObject);
begin
 var1 := 'mensagem';
 edit1.text : = var1;

end;



end.