Interesting to see an interactive Fortran as I started with Fortran in my first Job - on my first day I was told there is a book in the company library go and

Interesting to see an interactive Fortran as I started with Fortran in my first Job - on my first day I was told there is a book in the company library go and learn Fortran For the really big Fortran systems I worked on in the 1980's (Map Reduce) the edit compile / link process could take several minutes for a single module - we did have a build system written in JCL to help automate this as well.