int main (int argc, char **argv) { QApplication a(argc, argv); MainWin w; w.resize(300,600); w.show(); return a.exec(); }
int main (int argc, char **argv) { QApplication a(argc, argv); MainWin w; #if QT_VERSION < 0x040000 a.setMainWidget(&w); #endif w.resize(300,600); w.show(); return a.exec(); }