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Re: endless loops suck [message #33831 is a reply to message #33827]

Sat, 01 February 2003 08:14

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

I wrote yesterday:

> I don't think so. The whole point of the BEGIN ... END syntax
> is to make the statements inside appear to be a single statement
> to the compiler. The only recourse is to let the loop go to
> completion. With an infinite loop, well, they don't call
> them "infinite" for no reason. :-)

Apparently I owe an apology to Pavel. It has been
pointed out to me by a long-time IDL newsgroup reader,
who wishes not to embarrass me, that I don't know what
the hell I'm talking about when it comes to this topic.
(Have you noticed that IDL newsgroup readers are exceptionally
kind to one another? It's one of the things that makes
this newsgroup so much fun to hang out in. :-)

So I admit, "infinite" WHILE loops *can* be interrupted, as
long as they use BEGIN ... END statement blocks.
Try this:

PRO Test
While 1 DO BEGIN
Print, 'Test before you Post!'
ENDWHILE
END

On my Windows machine I can interrupt this program (after
I've learned my lesson) by doing a CNTL-Break.

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: endless loops suck By: Thomas Gutzler on Mon, 03 February 2003 17:57
		Re: endless loops suck By: Pete[2] on Mon, 03 February 2003 15:36
		Re: endless loops suck By: Thomas Gutzler on Sun, 02 February 2003 19:18
		Re: endless loops suck By: David Fanning on Sat, 01 February 2003 08:14
		Re: endless loops suck By: David Fanning on Fri, 31 January 2003 11:38
		Re: endless loops suck By: Pavel A. Romashkin on Fri, 31 January 2003 11:11
		Re: endless loops suck By: Timm Weitkamp on Fri, 31 January 2003 05:02
		Re: endless loops suck By: thompson on Tue, 04 February 2003 09:11
		Re: endless loops suck By: thompson on Tue, 04 February 2003 09:13
		Re: endless loops suck By: Timm Weitkamp on Tue, 04 February 2003 01:14

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