4.4BSD/usr/src/old/ratfor/ratfor.1

.\" Copyright (c) 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This module is believed to contain source code proprietary to AT&T.
.\" Use and redistribution is subject to the Berkeley Software License
.\" Agreement and your Software Agreement with AT&T (Western Electric).
.\"
.\"	@(#)ratfor.1	8.1 (Berkeley) 6/6/93
.\"
.Dd June 6, 1993
.Dt RATFOR 1
.Os ATT 7th
.Sh NAME
.Nm ratfor
.Nd rational Fortran dialect
.Sh SYNOPSIS
.Nm ratfor
.Op Ar option ...
.Op Ar filename ...
.Sh DESCRIPTION
.Nm Ratfor
converts a rational dialect of Fortran into ordinary irrational Fortran.
.Nm Ratfor
provides control flow constructs essentially identical to those in C:
.Bl -tag -width indent
.It Statement grouping:
{ statement; statement; statement }
.It Decision-making:
.Bd -unfilled -compact
if (condition) statement { else statement }
switch (integer value) {
\tcase integer:	statement
\t...
\t[default]: statement
}
.Ed
.It Loops:
.Bd -unfilled -compact
while (condition) statement
for (expression; condition; expression) statement
do limits statement
repeat statement [until (condition)]
break
next
.Ed
.El
.Pp
And some syntactic sugar to make programs easier to read and write:
.Bl -tag -width Fl
.It Free form input:
multiple statements/line; automatic continuation
.It Comments:
# this is a comment
.It Translation of relationals:
>, >=, etc., become .GT., .GE., etc.
.It Return (expression)
returns expression to caller from function
.It Define:
define name replacement
.It Include:
include filename
.El
.Pp
.Nm Ratfor
is best used with
.Xr f77  1  .
.Sh SEE ALSO
.Xr f77 1
.Rs
.%A B. W. Kernighan
.%A P. J. Plauger
.%T "Software Tools"
.%I Addison-Wesley
.%D 1976
.Re
.Sh HISTORY
.Nm Ratfor
appeared in
.At v6 .