term% cat index.txt EFL(1) General Commands Manual EFL(1)
NAME
efl - extended Fortran language preprocessor
SYNOPSIS
efl [ option ... ] [ filename ... ]
DESCRIPTION
Efl compiles a program written in the EFL language into clean Fortran.
Efl provides the same control flow constructs as does Ratfor (1), which
are essentially identical to those in C:
statement grouping with braces;
decision-making with if, if-else, and switch-case; while, for,
Fortran do, repeat, and repeat...until loops; multi-level break
and next. In addition, EFL has C-like data structures, and more
uniform and convenient input/output syntax, generic functions.
EFL also provides some syntactic sugar to make programs easier
to read and write:
free form input:
multiple statements/line; automatic continuation statement label
names (not just numbers),
comments:
# this is a comment
translation of relationals:
>, >=, etc., become .GT., .GE., etc.
return (expression)
returns expression to caller from function
define:
define name replacement
include:
include filename
The Efl command option -w suppresses warning messages. The option -C
causes comments to be copied through to the Fortran output (default);
-# prevents comments from being copied through. If a command argument
contains an embedded equal sign, that argument is treated as if it had
appeared in an option statement at the beginning of the program. Efl
is best used with f77(1).
SEE ALSO
f77(1), ratfor(1).
S. I. Feldman, The Programming Language EFL, Bell Labs Computing Sci‐
ence Technical Report #78.
EFL(1)