unit Unit1;//revers

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses StrUtils;

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  source, target : AnsiString;
begin
  source := '123456789';
  target := AnsiReverseString(source);

  ShowMessage('Source = '+source);
  ShowMessage('Target = '+target);
end;
end.