QPushButton and connect problem(((

[make]

hi! I am new to qt and now I have a little problem((

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
 
  QWidget wnd;
  wnd.resize(200, 100);
  wnd.setWindowTitle("w3.cpp");
  wnd.show();
 
  QPushButton *btn = new QPushButton("Press Me", &wnd);
  QObject::connect(btn, SIGNAL(clicked()), btn, SLOT(setText("hi!")));
  btn->move(50, 40);
  btn->show();
 
  return app.exec();
}

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  
  QWidget wnd;
  wnd.resize(200, 100);
  wnd.setWindowTitle("w3.cpp");
  wnd.show();
  
  QPushButton *btn = new QPushButton("Press Me", &wnd);
  QObject::connect(btn, SIGNAL(clicked()), btn, SLOT(setText("hi!")));
  btn->move(50, 40);
  btn->show();

  return app.exec();
}

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i just want to do such thing - after clicking button its text changes to "hi"))
where is my mistake??? help please((