text: #ifndef MAINWINDOW_H
  #define MAINWINDOW_H
  
  #include <QMainWindow>
  #include <QStack>
  
  QT_BEGIN_NAMESPACE
  namespace Ui { class MainWindow; }
  QT_END_NAMESPACE
  
  class MainWindow : public QMainWindow
  {
      Q_OBJECT
  
  public:
      MainWindow(QWidget *parent = nullptr);
      ~MainWindow();
  
  private slots:
      void on_Number_1_clicked();
  
      void on_Number_2_clicked();
  
      void on_Number_3_clicked();
  
      void on_Number_4_clicked();
  
      void on_Number_5_clicked();
  
      void on_Number_6_clicked();
  
      void on_Number_7_clicked();
  
      void on_Number_8_clicked();
  
      void on_Number_9_clicked();
  
      void on_Number_0_clicked();
  
      void on_Enter_Button_clicked();
  
      void on_Clear_Button_clicked();
  
      void on_Del_Button_clicked();
  
      void on_Op_Addiction_clicked();
  
      void on_Op_Multiplication_clicked();
  
      void on_Op_Subtraction_clicked();
  
      void on_Op_Division_clicked();
  
      void on_Rol_Button_clicked();
  
      void on_Arrow_Up_clicked();
  
      void on_Arrow_Down_clicked();
  
  private:
      Ui::MainWindow *ui;
      QStack<double> Numbers;
      int count;
      void Print();
      int Verification();
      int aux;
      QString symbol;
  
  };
  #endif // MAINWINDOW_H
  