You are looking at a very old, but free version of the course. If you are interesed the most recent version, check it out on the Perl Maven site.

7.5. Results

>perl examples/bc/bc1.pl
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
30
Success

If you are interested in on-site trainings by the author, please contact me directly.