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Re: negation operator [message #49328 is a reply to message #49324]

Thu, 13 July 2006 07:15

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

Hi,

On Thu, 13 Jul 2006, greg michael wrote:

> This is odd...
>
> IDL> print,-100 > -90 < 90
>
> print,-100 > -90 < 90
> ^
> Syntax error.
> IDL> print,-100 > (-90) < 90
> -90
>
> Is there any reason why a negation operator should ever come lower than
> anything else?
>
> Greg
>
>

yes, operator precedence. <, > and unary - has the same precedence in IDL,
so they can not follow each other immediately.

regards,
lajos

ps: in this respect I have followed the C precedence rules in FL, where
unary + and - have higher precedence than * (multiplication). So in FL
the above statements are correct and give the same result.

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[Message index]

		Re: negation operator By: greg michael on Fri, 14 July 2006 08:02
		Re: negation operator By: Foldy Lajos on Thu, 13 July 2006 09:35
		Re: negation operator By: JD Smith on Thu, 13 July 2006 09:17
		Re: negation operator By: Foldy Lajos on Thu, 13 July 2006 07:15

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