belajar delphi zizah

unit Urumus;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Label1: TLabel;
Label2: TLabel;
Edtb1: TEdit;
edtb2: TEdit;
Label3: TLabel;
edtC: TEdit;
Label4: TLabel;
btnjumlah: TButton;
btnhapus: TButton;
btnkeluar: TButton;
procedure btnjumlahClick(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure btnhapusClick(Sender: TObject);
procedure btnkeluarClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.btnjumlahClick(Sender: TObject);
var
a:integer;
b:integer;
c:integer;
begin
a:=strtoint(Edtb1.Text);
b:=strtoint (edtb2.Text);
c:= (a*a)+(b*b);
edtC.Text:=IntToStr(c);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
Edtb1.Text:='';
edtb2.Text:='';
edtC.Text:='';
end;
procedure TForm1.btnhapusClick(Sender: TObject);
begin
FormCreate(Sender);
Edtb1.SetFocus;
end;
procedure TForm1.btnkeluarClick(Sender: TObject);
begin
close;
end;
end.