How can I execute a fortran program?

http://www.mesoscale.iastate.edu/agron505/compile.htm

You'll need to compile it for the environment in which it is expected to run. If it is a binary application, it will probably only run in the original or similar environment.

Since you are using Cygwin, can we assume this originally ran on a Unix?

Hello Jim,

It's an honor to have an 85-year-old techie in the forums here.

While I'm not a Fortran programmer, I looked around and was able to find a simple Fortran compiler for Windows. It's called G95, and you can download it here:
http://ftp.g95.org/v0.92/g95-MinGW.exe

If you're not using Windows, here's a list of G95 for other platforms:
http://www.g95.org/downloads.shtml#V0.92

I've never used Fortran before, but I was able to download G95 and managed to successfully compile 3 or 4 sample Fortran programs in under 5 minutes.

G95 is a command line application, so you would go into the directory where you've installed it, and type "g95 hello.f" to compile a program whose source code is in a file called "hello.f". When the compiler finishes, it creates an executable called "a.exe" by default. Once you have the compiled file, you're ready to use it by running it.

Hopefully this helps you with your quest to resurrect your old code.

P.S. If you're looking for sample Fortran code, here is the link where I downloaded a few files just to test the G95 compiler:
http://www.personal.psu.edu/jhm/f90/progref.html

reference the code when it resides in say notepad. Or in a text file, if that's what you mean.

If you are reading it in Notepad, you probably are looking at the source code. You are reading what you originally wrote, yes? You can just compile it, then, for any platform you like. ThePickle posted a reference to a compiler above. You can also look up Fortran debuggers if you want to play with the code some more - a debugger could be handy, then.

Some notes on Fortran under Cygwin:
http://www.neuralwiki.org/index.php?title=Running_Fortran_from_cygwin
http://www.ccp14.ac.uk/tutorial/compiler/cygnus-gnuwin32/index.html
http://www.physicsforums.com/showthread.php?t=252910

and wait for a big lightning bolt!

;-)

Failing that, it's probably easier to do a re-write. I'll bet that takes less time and fewer headaches for you.

If you're getting a "file not found" error message, simply save a copy of the source file in the same directory where the G95 compiler resides (in the G95/bin directory).

Or, you can specify the path of the source file on the command line. So instead of typing "g95 -o lk lk3.f90", you would instead type "g95 -o lk c:\g95\bin\lk3.f90", assuming of course that you created a G95 directory off the root, and you put your source file into the bin subdirectory.

But file location problems aside, the thing is that I tried compiling your source, and G95 seems to be having problems with it. At first, it was having problems with the first few lines in your source which were obviously comment lines, so the compiler should ignore them...but it was trying to compile them. As I said, I know nothing about Fortran, so I didn't know the correct way to declare comments...but after quickly looking at some of the other sample source files I downloaded yesterday, it seems everything is fine...so I don't know why the compiler won't accept your comments even though they appear to be declared correctly.

I'm trying to figure out what's going on, and I'll post an update here once I have something useful.