Convert F to C

f to c conversion pretty much describes parsing or some kind of transformation between scripts written in different programming languages, something that might be very tricky to do. It often actually requires manual rewriting of the code, but that requires knowledge of both programming languages. If you have specific issues or needs for some particular programming language, it would be best to consult one of the many community forums.

Simply put, it is impossible to convert F to C directly.
Thus, there is no so-called f to c converter or a free online .f to .c converter to be found.