contoh delphi mencari total bayar

 contoh soal delphi:

jika harga jual minimal 200.000. maka pembeli mendapatkan potongan 10% dari harga jual dan jika kurang maka 0% potongannya.
hitunglah total bayarnya.
Rumus:

unit Unit7;

interface

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

type
  TForm7 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Label7: TLabel;
    tsatu: TEdit;
    tjum: TEdit;
    tbayar: TEdit;
    tpotong: TEdit;
    ttotal: TEdit;
    Button1: TButton;
    Button2: TButton;
    tbeli: TEdit;
    Label8: TLabel;
    procedure tsatuChange(Sender: TObject);
    procedure tjumChange(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form7: TForm7;

implementation

{$R *.dfm}

procedure TForm7.tsatuChange(Sender: TObject);
begin
    if strtoint(tsatu.Text)>=200000
    then
    tpotong.Text:=inttostr(strtoint(tsatu.text)* 10 div 100)
else
    tpotong.text:='0'

end;

procedure TForm7.tjumChange(Sender: TObject);
begin

tbayar.Text:=inttostr(strtoint(tjum.Text)*strtoint(tsatu.Text));
if strtoint(tbayar.Text)>=200000 then
      tpotong.text:=inttostr(strtoint(tbayar.text)* 10 div 100)

else
     tpotong.text:='0';
     ttotal.text:=tbayar.text;
     ttotal.text:=inttostr(strtoint(tbayar.text) - strtoint(tpotong.text))
end;

procedure TForm7.Button2Click(Sender: TObject);
begin
 close
end;

procedure TForm7.Button1Click(Sender: TObject);
begin
tjum.Text:='0';
tbayar.Text:='0';
tpotong.Text:='0';
tsatu.Text:='0';
ttotal.Text:='0';
tbeli.Text:='';
tbeli.SetFocus;
end;

end.


contoh program ketika dijalankan