If edition 3 is like edition 2 was, then I advise you to read their disclaimer about limitations of the program and then look very carefully at the list of students and grades that they have.

The hidden moral is the old saying, "Don't make an ASS out of U and ME."

There are a lot of gems like that in the book. That one sticks out in my memory because when I was first learning Perl I skimmed the first chapter, went back and began reading more carefully. I got to that, tried to figure out the example, and did. I read their comment, figured out why it was true, smirked at the pun, and then read the input file. Again.

That was when I decided that whoever wrote this book was rather different than the authors of the VB garbage I had been dealing with. These people had my kind of humor...