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If you are still using Fortran 77, why?
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In the recent thread

https://www.reddit.com/r/fortran/comments/1bmn0xj/most_popular_programming_languages_listing/

a few people mentioned that they are still programming in Fortran 77. May I ask why? There are automatic tools to translate fixed source form to free. You can use a modern Fortran compiler such as gfortran to compile old code, perhaps with the std=legacy option, and you can use features such as allocatable arrays, array operations, derived types, and DO-END DO etc. in new code. (DO-END DO was not part of the F77 standard, but most compilers did support it, and much Fortran-77-style code does use it.)

What are the institutional constraints keeping some projects in Fortran 77?

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Honestly it's pretty easy to pick up if you know Fortran at all, or pretty much any low-ish level programming language really. It's not a big distinguisher in terms of jobs, and there's not really loads of specialist Fortran jobs out there anyway. Generally we're scientists etc who also use Fortran, and those science skills are typically more valuable - you're more likely to keep the analysis experience but covert to Python than to keep Fortran but drop the science.

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