QT中如何进行DEBUG和使用cout,cin等

qDebug() << "Date:" << QDate::currentDate();
qDebug() << "Types:" << QString("String") << QChar('x') << QRect(0, 10, 50, 40);
qDebug() << "Custom coordinate type:" << coordinate;
qDebug() << "Date:" << QDate::currentDate();
qDebug() << "Types:" << QString("String") << QChar('x') << QRect(0, 10, 50, 40);
qDebug() << "Custom coordinate type:" << coordinate;

#include <QApplication>
#include <QTextStream>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QTextStream out(stdout)；
out << "is QTextStream out " << endl;
return app.exec();
}