procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
if not(key in ['0'..'9']) then key:=#0;
end;
procedure TForm1.Edit2KeyPress(Sender: TObject; var Key: Char);
begin
if not(key in ['0'..'9']) then key:=#0;
end;
procedure TForm1.Edit3KeyPress(Sender: TObject; var Key: Char);
begin
if not(key in ['0'..'9']) then key:=#0;
end;
procedure TForm1.Edit4KeyPress(Sender: TObject; var Key: Char);
begin
if not(key in ['0'..'9']) then key:=#0;
end;