Private function in Fortran

Question

How do I declare a private function in Fortran?

Answer 1

I've never written a line of FORTRAN, but this thread about "Private module procedures" seems to be topical, at least I hope so. Seems to contain answers, at least.

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jaredor summary:

The public/private attribute exists within modules in Fortran 90 and later. Fortran 77 and earlier--you're out of luck.