Design and implement your own simple but usable programming language.

It should include at least the normal arithmetical, relational, and
logical operators on integers or doubles/floats or both.

It should include statements for
     assigning a new value to a variable
     printing a value
     printing a fixed string (no need for string operators)
     conditional execution (e.g. if)
     repeated execution (e.g. while)

Make any reasonable design decisions, but use the recursive descent
parsing method covered in classes 21 to 24 to build a syntax tree,
then evaluate that tree by a method at least as good as the one
covered in class 16.

Combine a short piece of documentation for your programming language
(so I can understand what I'm looking at), your program code, and
sample runs (typescripts and/or screenshots) in a single readable
document in either word or pdf format.

Check the document to make sure long lines don't disappear over
the edge of the page and it really is readable and submit it
in the usual way.