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Re: A simple IF statement question [message #42522 is a reply to message #42513]

Mon, 14 February 2005 06:49

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Andry William writes:

> I am using IDL 6.1 on Linux SUSE. I am writing a simple code using the
> IF statement and am wondering about the following result:
>
> IDL> IF 1 THEN PRINT, '1' ELSE PRINT, 'None'
> 1
> IDL> IF 2 THEN PRINT, '2' ELSE PRINT, 'None'
> None
> IDL> IF 19 THEN PRINT, '19' ELSE PRINT, 'None'
> 19
> IDL> IF 24 THEN PRINT, '24' ELSE PRINT, 'None'
> None
> IDL> IF 0 THEN PRINT, '0' ELSE PRINT, 'None'
> None
>
> Am I wrong when I expect the IF statement to return always TRUE if the
> condition is not 0 (I mean something like 1,2,3,4,....)?

Yes, you are wrong. :-)

Here is an article you might want to read:

http://www.dfanning.com/code_tips/bitwiselogical.html

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		A simple IF statement question By: andry_william on Mon, 14 February 2005 05:55
		Re: A simple IF statement question By: Benjamin Luethi on Mon, 14 February 2005 06:37
		Re: A simple IF statement question By: David Fanning on Mon, 14 February 2005 07:11
		Re: A simple IF statement question By: David Fanning on Mon, 14 February 2005 06:49

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