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    <p>The best place for checking the differences between the two is the fortran standards drafts (latest drafts are practically identical to the published standards; only they're free for download).</p> <p>For example, <a href="http://www.fortran.com/F77_std/rjcnf.html" rel="nofollow">f77 standard</a>.</p> <p>The problem however is that in the time of fIV standards were not so followed, and almost all (I can even safely say <em>all</em>) compilers included a variety of vendor extensions, of which some are surely found in your program as well. So, take a compiler manual, if you have one, as well.</p> <p>The process of "updating to f77" (Gawd, I never thought I would say that - "updating to f77") would for you, be best to go in a way.<br> a) take a fortran short tutorial somewhere (a lot of them on the internet); just to see what fortran looks like<br> b) once you start recognizing program elements and structures, you can start translating it. Probability is that you will have to translate a lot of TYPE (depends) to WRITE or PRINT, modify some IF statements, modify some file input/output operations, you'll probably also encounter some COMMONs, with which you can have more or less problems, ... in any case, try, and when get stuck, post here.</p> <p>How big is your assignment?</p> <p>p.s. As I said in some comment above, chances are the program you're translating isn't really fIV but a mixture of fIV, f66/77, maybe even some elements of f90 - but your professor/person giving the assignment isn't aware of the difference. Unless you just copied it from an old data tape. I used to see such examples all the time.</p>
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    1. POUpdate from Fortran IV to Fortran 77
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    1. COThe program is not so big, 2 KLOC. And you are right that it is lots of special commands, many call to the "database". There is an old typewriter written manual for the compiler. I may try to interpret it.
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    2. CO@magol - Fortran does not have *that many* keywords (f77 - maybe 30, give or take) and for that initial stage you'll mostly need to translate i/o functions (read/write/file open/close ...), and maybe some DO loops and IF statements. After that it will in my guess, compile on '77. But, I find it very hard to believe that there isn't a f90 compilant compiler for your platform. In your comment above, did you mean that there doesn't exist one or that f77 is the newest compiler you've got available at site?
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    3. COThe operating system (named MAX) has not been updated somewhat since around 1990, and that's when we got Fortran 77. There are no newer version to get to this platform.
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