Неправильно работает цикл

procedure TForm1.Button1Click(Sender: TObject);
var
i,R,k:Integer;
s:string;
begin
k:=200;
R:=0;
if edit1.GetTextLen>0 then
Begin
s:='';
for i := 0 to Edit1.GetTextLen do
R:=Ord(edit1.Text[i]);
R:=k-R;
dec(R);
 
Edit2.Text:=IntToStr(R);
 
 
End else showMessage('BBB');
 
 
 
end;
 
end.

procedure TForm1.Button1Click(Sender: TObject);
var
i,R,k:Integer;
s:string;
begin
k:=200;
R:=0;
if edit1.GetTextLen >0 then
Begin
s:='';
for i := 1 to Edit1.GetTextLen do
 
begin
R:=Ord(Edit1.Text[i]);
R:=k-R;
R:=R-i;
s:=IntToStr(R);
Edit2.Text:=s;
end;
 
 
 
End else showMessage('BBB');
 
 
 
end;
 
end.

unit MainU;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
 
type
  TForm1 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Button1: TButton;
    Label2: TLabel;
    Edit2: TEdit;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.Button1Click(Sender: TObject);
var
i:integer;
s:string;
begin
s:='';
for i:=1 to edit1.GetTextLen do
s:=s+inttostr(200-ord(edit1.text[i])-i)+'-';
s[length(s)]:=';';
edit2.Text:=s;
end;
 
procedure TForm1.Button2Click(Sender: TObject);
begin
close;
end;
 
procedure TForm1.FormCreate(Sender: TObject);
begin
Button1Click(Sender);
end;
 
end.