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main.cpp Example File
tutorials/tutorial/t2/main.cpp

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 #include <QApplication>
 #include <QFont>
 #include <QPushButton>

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);

     QPushButton quit("Quit");
     quit.resize(75, 30);
     quit.setFont(QFont("Times", 18, QFont::Bold));

     QObject::connect(&quit, SIGNAL(clicked()), &app, SLOT(quit()));

     quit.show();
     return app.exec();
 }