Path: utzoo!utgpu!attcan!uunet!peregrine!elroy!ames!ncar!tank!uxc!uxc.cso.uiuc.edu!uxg.cso.uiuc.edu!uxe.cso.uiuc.edu!hirchert
From: hirchert@uxe.cso.uiuc.edu
Newsgroups: comp.lang.fortran
Subject: Re: Are GOTOs restricted in Fortran 88
Message-ID: <50500088@uxe.cso.uiuc.edu>
Date: 1 Nov 88 18:38:00 GMT
References: <4213@pitt.UUCP>
Lines: 24
Nf-ID: #R:pitt.UUCP:4213:uxe.cso.uiuc.edu:50500088:000:1201
Nf-From: uxe.cso.uiuc.edu!hirchert    Nov  1 12:38:00 1988


Debbie Whitfield(whit@pitt.UUCP) asks
>/* ---------- "Are GOTOs restricted in Fortran 88" ---------- */

>    I would like to know if the standard permits GOTOs to jump into
>control structures; loops, if-then-elses, or procedures.  
>    
>Thanks in advance for your information.

. FORTRAN 77 prohibited jumps into DO-loops.  This restriction was retained in
  Fortran 8x and extended to apply to the new forms of DO loops as well.
. FORTRAN 77 prohibited jumps into block-IF constructs from outside the
  construct with the "exception" that a branch to the END IF statement is
  permitted (and, in effect, equivalent to branching to a CONTINUE statement
  following the END IF statement).  Fortran 8x has the same rules for block-IF,
  but flags the "exception" as obsolescent, so it might be removed in Fortran
  9x.  Fortran 8x also prohibits jumps into its other block constructs in
  in general.
. Both FORTRAN 77 and Fortran 8x prohibit jumps into or out of a procedure.
  (In Fortran 8x, this applies to internal procedures and module procedures as
  well as the external procedures of FORTRAN 77.)

Kurt W. Hirchert     hirchert@ncsa.uiuc.edu
National Center for Supercomputing Applications