Anyways, in the class we made our own interpreter for a language KLOGO, specified by the professor. It is a "logo" like language, in that it interprets your commands and moves a turtle around to draw a picture. We used flex and bison for our parser/scanner respectively and the graphics professor at my school programed the graphics part we were to interface with. After the scanning and parsing an AST was produced, that was type checked and finally executed the code. It sounds pretty simple when I say it now, but it was a lot of work. Below is an image of my interpreter interpreting a program I made. It demonstrates most features of the interpreter. Note: the output in the terminal was to demonstrate to the professor that it actually was working, and not just an image I drew.
