Read&Writee in file

[cebin]

i want to copy the contents of one file to another file.But using the following code only first line is copied;

QFile f("/root/Desktop/n.txt");
    f.open(QIODevice::ReadOnly | QIODevice::Text);
     QFile f1("nn.txt");
 f1.open(QIODevice::WriteOnly | QIODevice::Text);
 
     QTextStream in(&f);
   QTextStream out(&f1);
 
   while(!f.atEnd())
   {
  in>>q;
  out<<q;
 
}
   f.close();
   f1.close();

QFile f("/root/Desktop/n.txt");
    f.open(QIODevice::ReadOnly | QIODevice::Text);
     QFile f1("nn.txt");
 f1.open(QIODevice::WriteOnly | QIODevice::Text);

     QTextStream in(&f);
   QTextStream out(&f1);

   while(!f.atEnd())
   {
  in>>q;
  out<<q;

}
   f.close();
   f1.close();

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