#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QLabel>
#include <QTextStream>

class App
{
  int state = 0;

  public:
    App(int state) : state(state)
    {
    }

    void increment()
    {
      this->state++;
    }

    int getState()
    {
      return this->state;
    }
};

int main(int argc, char *argv[])
{
  App appLogic(0);


  QApplication appPresentation(argc, argv);

  QWidget window;

  QPushButton *btn = new QPushButton("Increment", &window);
  btn->setGeometry(10, 10, 200, 50);

  QLabel *label = new QLabel(QString::number(appLogic.getState()), &window);
  label->setGeometry(10, 60, 100, 100);

  window.resize(640, 480);
  window.show();

  return appPresentation.exec();
}