Menghitung Luas dan Volume Balok Dengan Delphi...

Lagi malas nulis panjang lebar ni tak copiin aja source code nya ya :

unit Unit1;

interface

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

type
  THITUNG = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Button1: TButton;
    Image1: TImage;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure Button2Click(Sender: TObject);


  private
  procedure bersih;
    { Private declarations }
  public
    { Public declarations }
  end;

var
  HITUNG: THITUNG;

implementation

{$R *.dfm}

Var p,l,t,vol,luas : integer; // tempatkan variabel di atas procedur

procedure THITUNG.Button1Click(Sender: TObject);
begin
//konversi dari string ke integer
P := StrToInt(Edit1.text);
L := StrToInt(Edit2.text);
T := StrToInt(Edit3.text);

Vol := P*L*T   ;
Luas := (2*P*T)+(2*P*L)+(2*T*L);

//konversi dari integer ke string
Edit4.Text := IntToStr(Vol);
Edit5.Text := IntToStr(Luas);

end;
procedure THITUNG.bersih;
begin
edit1.text :='';
edit2.Text :='';
edit3.Text :='';
edit4.text :='';
edit5.Text :='';
end;

procedure THITUNG.FormActivate(Sender: TObject);
begin
bersih;

end;

procedure THITUNG.Button2Click(Sender: TObject);
begin
CLOSE;
end;

end.