This document contains code for a Delphi application with labels, text boxes, buttons, and event handlers. The application allows a user to enter product code, name, price, quantity, and calculates the total. It has buttons to calculate the total, clear the fields, and close the form. The code defines the form components, declares variables, and contains procedures for the button click and key press event handlers to perform the calculations and actions.

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Latihan 4
Object Name Caption
Button1 Bhitung HITUNG
Button2 Bisi ISI LAGI
Button3 Bclose CLOSE
Object Name Text
Edit1 Ekode
Edit2 Enama
Edit3 Ehrg
Edit4 Ejml
Edit5 Etotal
Edit3 ehrg
LISTING Latihan 4
unit lat4;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Label1: TLabel;
Label2: TLabel;
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Shape1: TShape;
Label3: TLabel;
Label4: TLabel;
Label5: TLabel;
Label6: TLabel;
Label7: TLabel;
ekode: TEdit;
enama: TEdit;
ehrg: TEdit;
ejml: TEdit;
etotal: TEdit;
bhit: TButton;
bisi: TButton;
bclose: TButton;
procedure bhitClick(Sender: TObject);
procedure bisiClick(Sender: TObject);
procedure bcloseClick(Sender: TObject);
procedure ejmlKeyPress(Sender: TObject; var Key: Char);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.bhitungClick(Sender: TObject);
var
hrg,jml,tot:real;
begin
hrg:=strtofloat(ehrg.Text);
jml:=strtofloat(ejml.Text);
tot:=hrg*jml;
etotal.Text:=floattostr(tot);
end;
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procedure TForm1.bisiClick(Sender: TObject);
begin
ekode.Text:='';
enama.text:='';
ehrg.Text:='';
ejml.Text:='';
etotal.Text:='';
ekode.SetFocus;
end;
procedure TForm1.bcloseClick(Sender: TObject);
begin
{if(application.MessageBox('yakin Mau keluar','Info',mb_yesno)=idyes)then
close;}
messageDlg('Ingin Menutup form',mterror, [mbyes],0);
close;
end;
procedure TForm1.ejmlKeyPress(Sender: TObject; var Key: Char);
var
hrg,jml,tot:real;
begin
if key= #13 then
begin
hrg:=strtofloat(ehrg.Text);
jml:=strtofloat(ejml.Text);
tot:=hrg*jml;
etotal.text:=floattostr(tot)
end;
end;
end.
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