Would appreciate someone's help with this newbie question.

With Qt 4.7, 4.8 and 5.0, my console application hangs when I run it. I'm expecting it to run to completion.

Qt Code: 
  1. // from app.h
  2. class App : public QObject
  3. {
  4.     Q_OBJECT
  5. public:
  6.     explicit App(QCoreApplication *app, QObject *parent = 0);
  7.  
  8.     void exec()
  9.     {
  10.         emit finished();
  11.     }
  12.  
  13. signals:
  14.     void finished();
  15.  
  16. public slots:
  17.  
  18. };
  19.  
  20. // from app.cpp
  21. App::App(QCoreApplication *app, QObject *parent) :
  22.     QObject(parent)
  23. {
  24.     connect(this, SIGNAL(finished()), app, SLOT(quit()));
  25. }
  26.  
  27. // from main.cpp
  28. int main(int argc, char *argv[])
  29. {
  30.     QCoreApplication a(argc, argv);
  31.  
  32.     App app(&a);
  33.     app.exec();
  34.  
  35.     return a.exec();
  36. }
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Why doesn't this app just immediately terminate and return control to the command line?