unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    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;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(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 Button10Click(Sender: TObject);
    procedure Button11Click(Sender: TObject);
    procedure Button13Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  cislo1,cislo2: string;
  cislo11,cislo22: real;
  axe:char;
  prvni:boolean;
  pocet:integer;


implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin

if axe in ['+','-','*','/'] then
cislo1:=cislo1+'1'
else
cislo2:=cislo2+'1';

end;

procedure TForm1.Button2Click(Sender: TObject);
begin
if axe in ['+','-','*','/'] then
cislo1:=cislo1+'2'
else
cislo2:=cislo2+'2';
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
if axe in ['+','-','*','/'] then
cislo1:=cislo1+'3'
else
cislo2:=cislo2+'3';
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
cislo1:=cislo1+'4';
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
cislo1:=cislo1+'5';
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
cislo1:=cislo1+'6';
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
cislo1:=cislo1+'7';
end;

procedure TForm1.Button8Click(Sender: TObject);
begin
cislo1:=cislo1+'8';
end;

procedure TForm1.Button9Click(Sender: TObject);
begin
cislo1:=cislo1+'9';
end;

procedure TForm1.Button10Click(Sender: TObject);
begin
cislo1:=cislo1+'0';
end;

procedure TForm1.Button11Click(Sender: TObject);
begin
cislo1:=cislo1+'.';
end;

procedure TForm1.Button13Click(Sender: TObject);
begin
axe:='+';
pocet:=pocet+1;

if pocet=1 then begin
cislo11:=Strtofloat(cislo1);

end;

if length(cislo1)>0 then begin
  cislo22:=Strtofloat(cislo2);
  cislo2:='0';
  cislo11:=cislo11+cislo22;
end;
  Label1.Caption:=floattostr(cislo11);
end;

end.