[3-15] I'm using DO to do some iteration, but it doesn't terminate.


Your code probably looks something like
   (do ((sublist list (cdr list))
        ..)
       ((endp sublist)
        ..)
     ..)
or maybe
   (do ((index start (+ start 2))
        ..)
       ((= index end)
        ..)
     ..)

The problem is caused by the (cdr list) and the (+ start 2) in the
first line. You're using the original list and start index instead of
the working sublist or index. Change them to (cdr sublist) and 
(+ index 2) and your code should start working.

Top Document: FAQ: Lisp Frequently Asked Questions 3/7 [Monthly posting]
Previous Document: [3-14] When producing formatted output in Lisp, where should you put the newlines (e.g., before or after the line, FRESH-LINE vs TERPRI,
Next Document: [3-16] My program works when interpreted but not when compiled!

Part1 - Part2 - Part3 - Part4 - Part5 - Part6 - Part7 - Single Page

[ Usenet FAQs | Search | Web FAQs | Documents | RFC Index ]

Send corrections/additions to the FAQ Maintainer:
ai+lisp-faq@cs.cmu.edu

Last Update December 05 2008 @ 00:11 AM