Nearly 11 years ago (!) I wrote an item for the Visual Fortran Newsletter on explicit interfaces in Fortran. In recent weeks, I have had to refer quite a few customers to this article, suggesting that many Fortran programmers don't understand the role and rules of explicit interfaces. However, when I reread the item, I realized that things had changed a bit since Fortran 95, so I figured it was time to revisit the issue.
In some of my earlier posts I've discussed new features in the Fortran language that might be unfamiliar to some. But this time I'm going to go the other way and describe some really old language features - so old that many newer Fortran programmers are mystified when they see them - but these features are still supported by many current compilers, including Intel Fortran. So let's set the Wayback Machine to the 1960s and have a look around.
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