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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
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-.TH EFL 1
-.SH NAME
-efl \- extended Fortran language preprocessor
-.SH SYNOPSIS
-.B efl
-[
-.I option ...
-]
-[
-.I filename ...
-]
-.SH DESCRIPTION
-.I Efl
-compiles a program written in the EFL language into clean Fortran.
-.I Efl
-provides the same control flow constructs as does Ratfor (1),
-which are essentially identical to those in C:
-.TP
-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:
-.TP
-free form input:
-multiple statements/line; automatic continuation
-statement label names (not just numbers),
-.TP
-comments:
-# this is a comment
-.TP
-translation of relationals:
->, >=, etc., become .GT., .GE., etc.
-.TP
-return (expression)
-returns expression to caller from function
-.TP
-define:
-define name replacement
-.TP
-include:
-include filename
-.PP
-.fi
-The Efl command option
-.B \-w
-suppresses warning messages.
-The option
-.B \-C
-causes comments to be copied through to the Fortran output (default);
-.B \-#
-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
-.B option
-statement at the beginning of the program.
-.I Efl
-is best used with
-.IR f77 (1).
-.SH "SEE ALSO"
-.IR f77 (1),
-.IR ratfor (1).
-.br
-S. I. Feldman,
-.IR "The Programming Language EFL",
-Bell Labs Computing Science Technical Report #78.