#include <QApplication>
#include <QWidget>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget w(Q_NULLPTR, Qt::WindowFlags(Qt::Dialog | Qt::WindowMinMaxButtonsHint
                                         | Qt::WindowCloseButtonHint));
    w.setWindowTitle("Can I be resized? "
                     "Do I have working minimise and maximise buttons?");
    w.show();
    return a.exec();
}