Everything here is taken from the slides for the "Compiler Construction"
course, i.e. it is directly from Prof. Ronald C. Moore.
Or at least, after all this time, I really don't remember having stolen
this code from somewhere else, but if you find an older copy that looks
similar, please let me know, so I can give credit where credit is due --
or disavow knowledge of that source (as the case may be).
You are in the following subdirectory
**`interpreter`
This code take mathematical expressions and evaluates them,
i.e. it outputs numbers.
See **Chapter 1 Front End Construction**, Slides 21 and 22 (and please let me know when the inevitable day comes that these slide numbers are no longer correct).