main.cpp Example File
tutorials/widgets/childwidget/main.cpp

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 #include <QtGui>

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     QWidget window;
     window.resize(320, 240);
     window.setWindowTitle(QApplication::translate("childwidget", "Child widget"));
     window.show();

     QPushButton *button = new QPushButton(
         QApplication::translate("childwidget", "Press me"), &window);
     button->move(100, 100);
     button->show();
     return app.exec();
 }