小练习2 QT按动按键程序退出

工程代码： 2_button_quit.rar  

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

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QPushButton *button = new QPushButton(QObject::tr("quit"));
    button->resize(300,100);
    button->setFont(QFont("Times",18,QFont::Bold));

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

    button->show();

    return app.exec();
}