efl(1)                                                     efl(1)



NAME
     efl - invokes the Extended Fortran Language

SYNOPSIS
     efl [-#] [-C] [-w] [file]...

ARGUMENTS
     -#   Suppresses comments in the generated program, and the
          default option.

     -C   Causes comments to be included in the generated
          program.

     file Specifies the file to be compiled.

     -w   Suppresses warning messages.

DESCRIPTION
     efl compiles a program written in the efl language into
     clean Fortran on the standard output.  The efl command
     provides the C-like control constructs similar to Ratfor:

          statement grouping with braces.

          decision-making:
               if, if-else, and select-case (also known as
               switch-case);
               while, for, Fortran do, repeat, and
               repeat ... until loops;
               multi-level break and next.

     The efl command has C-like data structures, for example:

        struct
             {
             integer flags(3)
             character(8) name
             long real coords(2)
             } table(100)

     The language offers generic functions, assignment operators
     (+=, &=, and so on.), and sequentially evaluated logical
     operators (&& and ||).  There is a uniform input/output
     syntax:

        write(6,x,y:f(7,2), do i=1,10 { a(i,j),z.b(i) })

     The efl command also provides some syntactic ``sugar'':

          free-form input:
               multiple statements per line; automatic
               continuation; statement label names (not just



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efl(1)                                                     efl(1)



               numbers).

          comments:

                  # this is a comment.

          translation of relational and logical operators:
               >, >=, &, and so on, become .GT., .GE., .AND., and
               so on,

          return expression to caller from function:

                  return (expression)

          defines:
               define name replacement

          includes:
               include file

     An argument with an embedded = (equal sign) sets an efl
     option as if it had appeared in an option statement at the
     start of the program.  Many options are described in the
     reference manual.  A set of defaults for a particular target
     machine may be selected by one of the choices:  system=unix,
     system=gcos, or system=cray.  The default setting of the
     system option is the same as the machine on which the
     compiler is running.  Other specific options determine the
     style of input/output, error handling, continuation
     conventions, the number of characters packed per word, and
     default formats.

     The efl command is best used with f77(1).

EXAMPLES
     The command sequence:

        efl prog.for > prog.f
        f77 prog.f -o prog

     will process the program prog.for through efl and then run
     the f77(1) compiler on the output from efl, generating an
     executable file named prog.

FILES
     /usr/bin/efl
          Executable file

SEE ALSO
     cc(1), f77(1)





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efl(1)                                                     efl(1)



     ``EFL Reference,'' in A/UX Programming Languages and Tools,
     Volume 1





















































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