LA AP2A 1

unit PunyaBayu;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Edit5: TEdit;
    Edit6: TEdit;
    Label5: TLabel;
    Label6: TLabel;
    Button4: TButton;
    Label7: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1: TForm1;
  jm, hg, tb, by, km : real;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
jm := strtofloat(Edit2.Text);
hg := strtofloat(Edit3.Text);
tb := (jm*hg);
Edit4.Text := floattostr(tb);
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
Edit1.Clear;
Edit2.Clear;
Edit3.Clear;
Edit4.Clear;
Edit5.Clear;
Edit6.Clear;
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
close;
end;
procedure TForm1.Button4Click(Sender: TObject);
begin
by := strtofloat(Edit5.Text);
km := (by-tb);
Edit6.Text := floattostr (km);
end;
end.