I changed the greeting to work with any person, and I modified the formula for circle_area in order
to calculate the area of a circle regardless of the radius provided.
A great distinction between a name and a value would be referring to a person's name versus their age.
Their name can change as mentioned in the directions, but they are still the same person regardless. However,
a person cannot change their age because it is a fixed rate that determines how long that person has been alive for.
Variables, on the other hand, are potentially the most useful items I have come across in CS. A variable can save an immense
amount of time for those working on the code as it can condense long lines of code into a single term or phrase. It also prevents
any potential repeat and can be easier to naviagte and manage for bugs.
Justin Toombs
jtoombs