Here's how to use doxygen on turing:

Document your source code in the manner described in class.  Then

    cd <your source directory>

    doxygen -g                          creates Doxyfile

Edit Doxyfile for the kind of input and output you want.  It's pretty self-
explanatory.  Then

    doxygen

once more to generate the documentation.  You only need to do the first steps
once.