It's an example from C++ GUI programming with Qt 4.
In this example, the book tells: the threads will print message to the console. but I cann't find even the console!

Qt Code: 
  1. void Thread::run()
  2. {
  3.     while (!stopped)
  4.         std::cerr << qPrintable(messageStr);
  5.     stopped = false;
  6.     std::cerr << std::endl;
  7. }
  8.  
  9.  
  10.  
  11. // the pro file
  12.  
  13. TEMPLATE      = app
  14. CONFIG       += console thread
  15. HEADERS       = thread.h \
  16.                 threaddialog.h
  17. SOURCES       = main.cpp \
  18.                 thread.cpp \
  19.                 threaddialog.cpp
To copy to clipboard, switch view to plain text mode 

Why? thanks!