Carculadora ayuda

[cristian22]

hola buenas tardes .. soy nuevo en este foro... eh estado trabajando con delphi en crear una carculadora hasta ahora voy bien, las operaciones basicas como suma, resta, division y multiplicacion me compilan bien
por ejemplo si yo hago 2+2= 4 me funciona pero quiero realizar una operacion convinada como "2+3-4*2"y cuando aprete la tecla "=" me tire el resultado de dicha operación, es decir que yo cuando realice "2+3" en el visor me muestre "5" al apretar la tecla - y al ingresar "4" y de nuevo al apretar la tecla * me muestre el resultado "1" y de nuevo ingrese "2" y al apretar esta vez la tecla "=" me salga el resultado que seria "2"
hay viene mi problema que no logro realizar esta tarea ; si alguien tiene alguna solución, o pueda guiarme para realizar este trabajo se los agradecería mucho aquí les dejo mi programa

Código Delphi [-]
type
  TForm2 = class(TForm)
    visor: TLabel;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button5: TButton;
    Button4: TButton;
    Button6: TButton;
    Button7: TButton;
    Button8: TButton;
    Button9: TButton;
    ButtonSuma: TButton;
    ButtonResta: TButton;
    ButtonIgual: TButton;
    ButtonProducto: TButton;
    ButtonDivision: TButton;
    button0: TButton;
    procedure button0Click(Sender: TObject);
    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 ButtonSumaClick(Sender: TObject);
    procedure ButtonRestaClick(Sender: TObject);
    procedure ButtonProductoClick(Sender: TObject);
    procedure ButtonDivisionClick(Sender: TObject);
    procedure ButtonIgualClick(Sender: TObject);
  private
  op: string;
  op2: real;
    op1:real;
  result:string;

    { variables}
  public
    { Public declarations }
  end;
 const
  Pi = 3.14;
var
  Form2: TForm2;


implementation

{$R *.dfm}

procedure TForm2.button0Click(Sender: TObject);
begin

   if (sender is tbutton) and (visor.Caption ='0') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

  else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button1Click(Sender: TObject);
begin

if (sender is tbutton) and (visor.Caption ='1') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button2Click(Sender: TObject);
begin;
if (sender is tbutton) and (visor.Caption ='2') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button3Click(Sender: TObject);
begin
   if (sender is tbutton) and (visor.Caption ='3') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button4Click(Sender: TObject);
begin
if (sender is tbutton) and (visor.Caption ='4') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button5Click(Sender: TObject);
begin
if (sender is tbutton) and (visor.Caption ='5') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button6Click(Sender: TObject);
begin
if (sender is tbutton) and (visor.Caption ='6') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button7Click(Sender: TObject);
begin
if (sender is tbutton) and (visor.Caption ='7') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button8Click(Sender: TObject);
begin
if (sender is tbutton) and (visor.Caption ='8') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.Button9Click(Sender: TObject);
begin
if (sender is tbutton) and (visor.Caption ='9') then
visor.Caption:= visor.Caption+(sender as tbutton).Caption

else
visor.Caption:= visor.Caption+(sender as tbutton).Caption
end;

procedure TForm2.ButtonDivisionClick(Sender: TObject);
begin
op2:= StrToFloat ( visor.Caption);
op:= '4';
visor.Caption:=''


end;

procedure TForm2.ButtonProductoClick(Sender: TObject);
begin

op2:= StrToFloat ( visor.Caption);
op:= '3';
visor.Caption:=''

end;

procedure TForm2.ButtonRestaClick(Sender: TObject);
begin

op2:= StrToFloat ( visor.Caption);
op:= '2';
visor.Caption:='';

end;

procedure TForm2.ButtonSumaClick(Sender: TObject);
begin

op2:= StrToFloat ( visor.Caption);
op:= '1';
visor.Caption:=''

end;

procedure TForm2.ButtonIgualClick(Sender: TObject);
 begin
 op1:= strtofloat(visor.Caption);
 if (op='1') then
 begin
 result:= floattostr(op2+op1);
  end
  else
  if (op='2') then
  begin
 result:= floattostr(op2-op1);
  end
  else
  if (op='3') then
  begin
result:= floattostr(op2*op1);
  end
    else
  if (op='4') then
  begin
    if (op1<>0) then
     begin
   result:= floattostr(op2/op1);
       end
       else
       showmessage('Divisor 0')

     end;
  visor.Caption:= result;
  end;
end.

[engranaje]

Si te he entendido bien bastaria con llamar al onclick del igual justo al principio del onclick de cualquier otro boton de operación.

De todos modos a la hora de hacer una calculadora igual te valdría la pena componer una string utilizando la notación polaca inversa
http:////es.wikipedia.org/wiki/Notac...polaca_inversa
y resolverla cuando le des al igual, depende mucho de cual quieres que sea el comportamiento.