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.\" Copyright (c) 1990 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"     @(#)ratfor.1	6.4 (Berkeley) 7/24/90
.\"
.Dd July 24, 1990
.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:
.Tw Fl
.Tp statement grouping:
{ statement; statement; statement }
.Tp decision-making:
.Ds I
if (condition) statement { else statement }
switch (integer value) {
\tcase integer:	statement
\t...
\t[default]: statement
}
.De
.Tp loops:
.Ds L
while (condition) statement
for (expression; condition; expression) statement
do limits statement
repeat statement [until (condition)]
break
next
.De
.Tp
.Pp
and some syntactic sugar to make programs easier to read and write:
.Tw Fl
.Tp free form input:
multiple statements/line; automatic continuation
.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
.Tp
.Pp
.Nm Ratfor
is best used with
.Xr f77  1  .
.Sh SEE ALSO
.Xr f77 1
.br
B. W. Kernighan and P. J. Plauger,
.Em Software Tools ,
Addison-Wesley,
1976.
.Sh HISTORY
.Nm Ratfor
appeared in Version 7 AT&T UNIX.

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