#include "QApplication.h" // note: in for Qt stuff, you can also use #include <QApplication> format
#include "QLabel.h"

//#include <QtWidgets> // note: use this in Qt5, <QtGui> in Qt4, with this, 
//with above line, you don't need include each single element, just like in Python

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QLabel *info_label = new QLabel("Hello Qt!");
    info_label->show();
    return app.exec();
}