unit1.~pas

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    Button7: TButton;
    Button8: TButton;
    Button9: TButton;
    Button10: TButton;
    Button11: TButton;
    Button12: TButton;
    Button13: TButton;
    Button14: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
    procedure Button8Click(Sender: TObject);
    procedure Button10Click(Sender: TObject);
    procedure Button11Click(Sender: TObject);
    procedure Button12Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button9Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button13Click(Sender: TObject);
    procedure Button14Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
    S  : Integer;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
Edit1.text:=Edit1.Text+'1';
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
Edit1.text:=Edit1.text+'2';
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
Edit1.text:=Edit1.text+'3';
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
Edit1.text:=Edit1.text+'4';
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
Edit1.text:=Edit1.text+'5';
end;

procedure TForm1.Button8Click(Sender: TObject);
begin
Edit1.text:=Edit1.text+'6';
end;

procedure TForm1.Button10Click(Sender: TObject);
begin
Edit1.text:=Edit1.text+'7';
end;

procedure TForm1.Button11Click(Sender: TObject);
begin
Edit1.text:=Edit1.text+'8';
end;

procedure TForm1.Button12Click(Sender: TObject);
begin
Edit1.Text:=Edit1.Text +'9';
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
Edit1.Text:=Edit1.text+'0';
end;

procedure TForm1.Button9Click(Sender: TObject);
begin
S:=StrToInt(Edit1.text);
Edit1.Text :='';
button14.Enabled:=false;
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
if button14.Enabled = false then
Edit1.Text:=IntToStr(StrToInt(Edit1.Text )+S)
else
Edit1.Text:=IntToStr(S-StrToInt(Edit1.Text ));
end;

procedure TForm1.Button13Click(Sender: TObject);
begin
Edit1.Text:='';
s:=0;
button9.Enabled := true;
button14.Enabled := true;
end;

procedure TForm1.Button14Click(Sender: TObject);
begin
S:=StrToInt(Edit1.text);
Edit1.Text :='';
button9.Enabled:=false;
end;

end.