efl(1)                              CLIX                              efl(1)



  NAME

    efl - Compiles an Extended FORTRAN Language program

  SYNOPSIS

    efl [flag ... ] [file ... ]

  DESCRIPTION

    The efl command compiles a program written in the EFL language into clean
    FORTRAN on stdout.  The command efl provides the C-like control constructs
    of 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

       -- multilevel break and next

    ⊕  C-like data structures.

       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 ||).  It has
    a uniform input/output syntax:

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

    EFL also provides some syntactic ``sugar'':

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

    comments:
           # this is a comment

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




  2/94 - Intergraph Corporation                                              1

  efl(1)                              CLIX                              efl(1)



    return expression to caller from function;
           return(expression)

    defines:
           define name replacement

    includes:
           include file

    The efl command understands several flag arguments:  -w suppresses warning
    messages, -# suppresses comments in the generated program, and the default
    flag -C includes comments in the generated program.

    An argument with an embedded = (equal sign) sets an EFL flag as if it had
    appeared in an flag statement at the start of the program.  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 flag is the same as the machine the compiler is running on.

    Other specific flags 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.

  RELATED INFORMATION

    Commands: acc(1), af77(1), cc(1), f77(1), ratfor(1)


























  2                                              Intergraph Corporation - 2/94