QDir appending current app's execution path to the QDir object's absolute path

if I will create a QDir object <in this case say myDir> with an invalid path <say INVALID> then the object's path contains the current execution directory + the INAVLID path which I had provided.
Example : Code Snippet

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    qDebug( "Hello");

    QDir myDir("INVALID"); /* this is invalid path and myDir.absolutePath() gives current working dir + INAVLID*/

    return a.exec();
}

I agree that path can be created at later stage which is more useful.
Let me example out here the linux case too.
Say /root/jitu does not exists.
my App is running at /home/XXX/
when I will do a QDir myDir("/root/jitu") the myDir.absolutePath() should not give me result like "/home/XXX/root/jitu"
Please make me understand if I am missing some thing about the QDir design.
~Regards,
Lalat <Commercial User>