Once upon a time, I worked on a small project that involved updating a chunk of Fortran code that did some sort of engineering calculation. The company hired so

Once upon a time, I worked on a small project that involved updating a chunk of Fortran code that did some sort of engineering calculation. The company hired some crusty old engineering professor somewhere who had no clue how to use any kind of source control to do the actual code update. My part of the project was to fix/update the part of this tool where the DLL built from this Fortran code was used by an Excel VBA script - you entered the input data in Excel, then some VBA fed it into the DLL, and stuck the output in some more cells. Getting all that to work right was an adventure.