#include <QtCore/qdebug.h>
#include <QtCore/qcoreapplication.h>
#include <iostream>
using namespace std;

int main(int argc, char **argv)
{
    cout << "pluto" << endl;
    QCoreApplication app(argc, argv);
    qDebug() << "pippo" << endl;
    return app.exec();
    //return 0;
}

qmake ...other args... CONFIG+=console

#include <QTextStream>

QTextStream cout(stdout);
cout << "stringn";

QTextSteam cerr(stderr);
cerr << "error!n";