Happy, because I’m glad to be helpful even after all these years.

Sad, because if I’d done my job better, it shouldn’t have been necessary to use this example after two generations of programmers have been born, raised, educated, and put to work.

Happy, because people are still at work trying to teach the fundamental lessons of our profession. That gives me hope.

Thank you, and keep up the good work.

Jerry
p.s. You can still buy The Psychology of Computer Program (in its Silver Anniversary Edition). That makes me happy and sad, too.