unit Unit1;

interface

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

type
  Toperator = (Plus,Minus,Gange,Divider);
  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;
    Button15: TButton;
    Button16: TButton;
    Button17: TButton;
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
    procedure Button10Click(Sender: TObject);
    procedure Button14Click(Sender: TObject);
    procedure Button11Click(Sender: TObject);
    procedure Button12Click(Sender: TObject);
    procedure Button13Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button16Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    procedure Button7Click(Sender: TObject);
    procedure Button8Click(Sender: TObject);
    procedure Button9Click(Sender: TObject);
    procedure FormShow(Sender: TObject);

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

var
  Form1: TForm1;
  Operator: Toperator;
  comma_space: integer;
  comma1: integer;
  i : integer;
  tal : Double;

implementation

{$R *.dfm}

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
case key of
#13 : Button14.Click;
#42 : Button12.Click;
#43 : Button10.Click;
#44 : Button15.Click;
#45 : Button11.Click;
#47 : Button13.Click;
#48 : Button16.Click;
#49 : Button1.Click;
#50 : Button2.Click;
#51 : Button3.Click;
#52 : Button4.Click;
#53 : Button5.Click;
#54 : Button6.Click;
#55 : Button7.Click;
#56 : Button8.Click;
#57 : Button9.Click;
end;

end;

procedure TForm1.Button10Click(Sender: TObject);
begin
Tal:=StrToFloat(Edit1.Text);
Operator:=Plus;
Edit1.Text:=FloatToStr(0);
Edit1.SetFocus;
end;

procedure TForm1.Button14Click(Sender: TObject);
begin
Case Operator of
Plus : Tal:=Tal+StrToFloat(Edit1.Text);
Minus: Tal:=Tal-StrToFloat(Edit1.Text);
Gange: Tal:=Tal*StrToFloat(Edit1.Text);
end;
if (Operator=Divider) AND (Edit1.Text='0') then
Edit1.Text:=FloatToStr(1)
else
Tal:=Tal/StrToFloat(Edit1.Text);

Edit1.Text:=FloatToStr(Tal);
Edit1.SetFocus;
end;

procedure TForm1.Button11Click(Sender: TObject);
begin
Tal:=StrToFloat(Edit1.Text);
Operator:=Minus;
Edit1.Text:=FloatToStr(0);
Edit1.SetFocus;
end;

procedure TForm1.Button12Click(Sender: TObject);
begin
Tal:=StrToFloat(Edit1.Text);
Operator:=Gange;
Edit1.Text:=FloatToStr(0);
Edit1.SetFocus;
end;

procedure TForm1.Button13Click(Sender: TObject);
begin
Tal:=StrToFloat(Edit1.Text);
Operator:=Divider;
Edit1.Text:=FloatToStr(0);
Edit1.SetFocus;
end;

procedure TForm1.Button16Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+0);
Edit1.SetFocus;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+1);
Edit1.SetFocus;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+2);
Edit1.SetFocus;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+3);
Edit1.SetFocus;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+4);
Edit1.SetFocus;
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+5);
Edit1.SetFocus;
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+6);
Edit1.SetFocus;
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+7);
Edit1.SetFocus;
end;

procedure TForm1.Button8Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+8);
Edit1.SetFocus;
end;

procedure TForm1.Button9Click(Sender: TObject);
begin
Edit1.Text:=FloatToStr(StrToFloat(Edit1.Text)*10+9);
Edit1.SetFocus;
end;

procedure TForm1.FormShow(Sender: TObject);
begin
Edit1.Text:=FloatToStr(0);
Edit1.SetFocus;
end;

end.