"I decided I didn't want to spend more than 20 hours on this exercise of learning Java, learning the IDE I was using, and producing a Lisp interpreter."
It has to be declared, defined, initialized, incremented, kept track of by the person reading the source.
"I decided I didn't want to spend more than 20 hours on this exercise of learning Java, learning the IDE I was using, and producing a Lisp interpreter."