Signals and Slots introduction Ahmed Magdy https://www.facebook.com/QtFci

make_connections.cpp

#include <QApplication>
#include <QPushButton>

int main(int argc, char *argv[])
{
        QApplication app(argc, argv);
        QPushButton *button = new QPushButton("Quit");

        QObject::connect(button, SIGNAL(clicked()),&app, SLOT(quit()));            //here is the most important part.

        button->show();
        return app.exec();
}