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Re: Weirdest Error Ever [message #50885 is a reply to message #50743]

Thu, 19 October 2006 07:59

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

Karsten Rodenacker wrote:
> This reminds me on a syntax error which is again and again bothering me:
>
> IDL> help,1 < -5
>
> help,1 < -5
> ^
> % Syntax error.
> IDL> help,1 < (-5)
> <Expression> INT = -5
> Possibly ...

This error is because <, >, +, and - have the same order of precedence.
So they are parsed left to right; "1 < -" is a syntax error. It does
mean that David is right in wanting to put ()'s around operands in a <
or > expressions (though in his particular case it was OK without them).

Mike
--
www.michaelgalloy.com

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[Message index]

		Re: Weirdest Error Ever By: Karsten Rodenacker on Thu, 19 October 2006 00:56
		Re: Weirdest Error Ever By: David Fanning on Wed, 18 October 2006 12:05
		Re: Weirdest Error Ever By: David Fanning on Wed, 18 October 2006 11:51
		Re: Weirdest Error Ever By: David Fanning on Wed, 18 October 2006 11:44
		Re: Weirdest Error Ever By: Foldy Lajos on Wed, 18 October 2006 11:32
		Re: Weirdest Error Ever By: David Fanning on Wed, 18 October 2006 11:10
		Re: Weirdest Error Ever By: David Fanning on Wed, 18 October 2006 11:03
		Re: Weirdest Error Ever By: Foldy Lajos on Wed, 18 October 2006 10:44
		Re: Weirdest Error Ever By: edward.s.meinel@aero. on Thu, 19 October 2006 08:02
		Re: Weirdest Error Ever By: Michael Galloy on Thu, 19 October 2006 07:59

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