text: #ifndef MAINWINDOW_H
  #define MAINWINDOW_H
  
  #include <QMainWindow>
  #include <QPushButton>
  #include <QLabel>
  
  namespace Ui {
      class MainWindow;
  }
  
  class MainWindow : public QMainWindow
  {
      Q_OBJECT
  
  public:
      explicit MainWindow(QWidget *parent = 0);
  private slots:
      void handleButton();
  private:
      QPushButton *m_button;
      QLabel *m_label;
      int counter;
  };
  
  #endif // MAINWINDOW_H
  