unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    edt1: TEdit;
    btn1: TButton;
    procedure btn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

F : TextFile;
S : String;
implementation

{$R *.dfm}


procedure TForm1.btn1Click(Sender: TObject);
begin

AssignFile(F, 'res.txt');
Rewrite(F);
S := edt1.Text;
WriteLn(F,S);
CloseFile(F);

end;

end.