New material will be covered during discussion for which you are responsible. For example, help with the projects, review for exams and instruction on the use of the UNIX system will take place during discussion rather than lecture. Your attendance in lecture and discussion is worth 4 percent of your grade. On days where attendance at lecture or discussion is low, attendance will be taken by a roll call. If attendance is uniformly high throughout the semester, then attendance will never be taken and every student will receive the full credit for attendance.
Email is good for lots of things, but it is horrible for debugging.
You should use my office hours, the TAs' office hours or the Help Center for debugging help. Use your real name. If you ask a good question by email, I will send your question and the reply to the entire class as well. If you do not want your question repeated to the entire class, please state so clearly in your message. Know how to include a plain text file in an email message without sending it as an attachment.