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From: ForthNet@willett.UUCP (ForthNet articles from GEnie)
Newsgroups: comp.lang.forth
Subject: ANS TC Magnet for LOOPS, EXIT, Term.
Message-ID: <577.UUL1.3#5129@willett.UUCP>
Date: 27 Feb 90 23:55:32 GMT
Organization: Latest link in the ForthNet chain.  (Pgh, PA)
Lines: 41


 Date: 02-26-90 (10:45)              Number: 2970 (Echo)
   To: IAN GREEN                     Refer#: 2961
 From: PETE KOZIAR                     Read: NO
 Subj: NESTED FOR LOOPS              Status: PUBLIC MESSAGE

 Well, the first possible problem is that the usual FORTH world uses 
 DO...LOOP instead of FOR...NEXT.  I haven't used the RTX processors, 
 but, on thier predecessors, the Novix chips, you needed to use -I 
 instead of I inside a FOR...NEXT loop. 

 As far as nested loops, here's an example for you to try: 

 : Goo 
    4 0 Do 
      5 0 Do 
        I . Space J . CR 
      Loop 
    Loop 
 ; 

 This should print out: 
 0 0 
 1 0 
 2 0 
 3 0 
 4 0 
 0 1 
 . 
 . 
 . 
 This is because I refers to the loop index of the current loop, and J 
 refers to the index of the next loop out.  Some FORTHs even have a K 
 for the nextmost outer loop; I have never seen an L. 

 Hope this helps! 
 ---
  * Via Qwikmail 2.01  The Baltimore Sun 
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