*qt_one_one

#include <QApplication>
#include <QLabel>
int main(int argc,char* argv[])
{
    QApplication app(argc,argv);
    QLabel* label = new QLabel("<h2><i>xxx</i>""<font color=red>xxx</font></h2>");
    label->show();
    return app.exec();
}

#include <QApplication>
#include <QLabel>
#include <QPushButton>
int main(int argc,char* argv[])
{
    QApplication app(argc,argv);
    //QLabel* label = new QLabel("<h2><i>xxx</i>""<font color=red>xxx</font></h2>");
    //label->show();
    QPushButton* button = new QPushButton("quit");
    QObject::connect(button,SIGNAL(clicked()),&app,SLOT(quit()));
    button->show();
    return app.exec();
}
QObject::connect prototype :
static bool connect(const QObject *sender, const char *signal,
                        const QObject *receiver, const char *member, Qt::ConnectionType =
#ifdef qdoc
                        Qt::AutoConnection
#else
#ifdef QT3_SUPPORT
                        Qt::AutoCompatConnection
#else
                        Qt::AutoConnection
#endif
#endif
        );