menghitung luas dalam program delphi

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label2: TLabel;
    Label3: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    GroupBox1: TGroupBox;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    Label5: TLabel;
    Label1: TLabel;
    Button8: TButton;
    Button9: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure GroupBox1Click(Sender: TObject);
    procedure Label4Click(Sender: TObject);
    procedure Button9Click(Sender: TObject);
    procedure Button8Click(Sender: TObject);
  private
    { Private declarations }

  public
    { Public declarations }

  end;

var
  Form1: TForm1;
  a,b:integer;
     d:integer;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
a:=strtoint(edit1.Text);
b:=strtoint(edit2.Text);
d:=a+b ;
label5.caption:=inttostr(d);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
a:=strtoint(edit1.Text);
b:=strtoint(edit2.Text);
d:=a-b ;
label5.caption:=inttostr(d);
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
a:=strtoint(edit1.Text);
b:=strtoint(edit2.Text);
d:=a*b ;
label5.caption:=inttostr(d);
end;

procedure TForm1.Button4Click(Sender: TObject);
var a,b: integer;
var d:real;

begin
 a:=strtoint(edit1.Text );
 b:=strtoint(edit2.Text );
 d:= (a / b) ;
 label5.Caption := floattostr(d);
end;

procedure TForm1.Button5Click(Sender: TObject);
var a,b,c ,i:integer;

begin
a:=strtoint(edit1.Text);
b:= strtoint(edit2.text);
d:=a;
for i:=1 to (b-1) do
begin
d:=d*a;
end;
label5.caption:=inttostr(d);
end;

procedure TForm1.Button7Click(Sender: TObject);
var a,b: integer;
var d:double;

begin
 a:=strtoint(edit1.Text );
 b:=strtoint(edit2.Text );
 d:= (a mod b) ;
 label5.Caption := floattostr(d);
end;

procedure TForm1.Button6Click(Sender: TObject);
var a,b,c: integer;

begin
 a:=strtoint(edit1.Text );
 b:=strtoint(edit2.Text );
 d:= a Div b ;
 label5.Caption := inttostr(d);
end;

procedure TForm1.GroupBox1Click(Sender: TObject);
begin
showmessage('Apakah Anda sudah Memahaminya');
application.Terminate ;
end;

procedure TForm1.Label4Click(Sender: TObject);
begin
showmessage('SUDAHKAN ANDA MENYIMPAN');
application.Terminate ;
end;

procedure TForm1.Button9Click(Sender: TObject);
begin
edit1.Clear ;
edit2.Clear ;
label5.Caption :='';
edit1.SetFocus ;
end;

procedure TForm1.Button8Click(Sender: TObject);
begin
showmessage('jangan lupa disimpan');
application.Terminate ;
end;

end.


"jangan lupa coba praktekkan Ya....."