#include <QApplication>
#include <QQmlApplicationEngine>
#include <QCoreApplication>
#include <QFile>
#include <QDataStream>
#include <QDebug>
#include <QStringList>

int main(int argc, char *argv[])

{ QCoreApplication a(argc, argv); QVariant v(3.3); // The variant now contains an double qDebug() << v.toString() << endl; return a.exec(); }

Qt 5.4 out "3.3"
Qt 5.5 out "3.2999999999999998"