gfortran issue

gfortran is just the compiler, it compiles the code into an executable (the a.out file). If you now run the a.out file (./a.out), it will actually execute your code.

 

Your code tidbit is not F90. gfortran also does not have a direct 90 compiler, it hasn't been supported in a while. use mpif90 (part of openMPI), ifort, or absoft.

First and foremost make sure this is the version of gfortran you have http://gcc.gnu.org/wiki/GFortranBinaries

nextly this is proper f90

Code:

      [COLOR="Blue"]program[/COLOR] helloWorld
            [COLOR="Magenta"]!proper new style fortran declaration[/COLOR]
            [COLOR="blue"]character[/COLOR](len=50)   :: name
            
            [COLOR="Magenta"]!This is my ghetto fortran[/COLOR]
            [COLOR="blue"]write[/COLOR](*,*) 'Who you be gangster?'
            [COLOR="blue"]read[/COLOR](*,*) name
           [COLOR="Magenta"] !the trim is used to eliminate trailing blanks[/COLOR]
            [COLOR="blue"]write[/COLOR](*,*) 'Wow ', trim(name),', you be fortran gangsta!' 
           [COLOR="Magenta"] !i mean you could use a fmt statement too, but i didnt feel like looking one up for this example[/COLOR]
      [COLOR="blue"]end program[/COLOR]

the above code will compile with gfortran, and do exactly what it is you wanted to do in your code snippet. I double checked just to be sure.

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now as to running
save the above code as hello.f90
go in terminal and type: gfortran hello.f90 -o hello
then to execute, type: ./hello

youll see it all work now

(if it doesnt allow you to execute, make sure you chmod to executable)
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finally if you want to compile openMPI for parallel fortran (we use it almost exclusively in computational physics), i explained it in an old post of mine here
http://forums.macrumors.com/showpost.php?p=12905721&postcount=5