@rjzak , if you’re interested further in Fortran, please see this thread.
Not too long ago, a respondent on this thread of yours had asked about sample code to illustrate briefly the features of Fortran to those looking at Fortran for the first time. I had chosen a Fibonacci function example for it as you will see in the code in that thread! Hopefully you will find the code sample of some interest. You may know of free Intel oneAPI Fortran compiler you can try toward the example.