NAME

efl − Extended Fortran Language

SYNOPSIS

efl [ options ] [ files ]

DESCRIPTION

Efl compiles a program written in the efl language into clean Fortran on the standard output.  Efl provides the C-like control constructs of ratfor(1):

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. 

Efl has C-like data structures, e.g.:

struct

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

The language offers generic functions, assignment operators (+=, &=, etc.), 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) })

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:

>, >=, &, etc., become .GT., .GE., .AND., etc. 

return expression to caller from function:

return (expression)

defines:

define name replacement

includes:

include file

Efl understands several option arguments: −w suppresses warning messages, −# suppresses comments in the generated program, and the default option −C causes comments to be included in the generated program. 

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 the compiler is running on. 

Other specific options determine the style of input/output, error handling, continuation conventions, the number of characters packed per word, and default formats. 

Efl is best used with f77(1).

SEE ALSO

cc(1), f77(1), ratfor(1). 

Hewlett-Packard Company  —  HP-UX Release 7.0: Sept 1989