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Re: A simple DLM question [message #81215 is a reply to message #81213]

Wed, 29 August 2012 10:50

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Wednesday, August 29, 2012 11:31:39 AM UTC-6, fawltyl...@gmail.com wrote:
>
> A '-' can be both unary (-3) and binary (a-3). Including the '-' in the constant would be erroneous in the binary case and you would get a syntax error.
>
> There is a similar feature (or bug?) in parsing the exponent of floating point literals. IDL accepts 1e- as a valid float number:
>
> IDL> help, 1e-
> <Expression> FLOAT = 1.00000
>
> But this results in a syntax error for expressions like 1e-a:
>
> IDL> a=0 & help, 1e-a
>
> a=0 & help, 1e-a
> ^
> % Syntax error.
>
> (I think 1e- should be invalid and 1e-a should be valid.)
>
> regards,
> Lajos

This is the one that always drives me nuts:
IDL> a = 3
IDL> help,1d+a
% Syntax error.
IDL> help,1d + a
<Expression> DOUBLE = 4.0000000

What kind of crazy language requires spaces to work properly?!
[Three cheers for whoever answers this question first! And IDL doesn't count...]

-Chris

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[Message index]

		Re: A simple DLM question By: Michael Galloy on Wed, 29 August 2012 11:16
		Re: A simple DLM question By: chris_torrence@NOSPAM on Wed, 29 August 2012 10:50
		Re: A simple DLM question By: Lajos Foldy on Wed, 29 August 2012 10:31
		Re: A simple DLM question By: Xin Tao on Wed, 29 August 2012 09:23
		Re: A simple DLM question By: chris_torrence@NOSPAM on Wed, 29 August 2012 08:55
		Re: A simple DLM question By: Xin Tao on Tue, 28 August 2012 22:03
		Re: A simple DLM question By: Craig Markwardt on Tue, 28 August 2012 18:10
		Re: A simple DLM question By: Xin Tao on Tue, 28 August 2012 14:16
		Re: A simple DLM question By: Jim Pendleton on Tue, 28 August 2012 09:06
		Re: A simple DLM question By: Xin Tao on Mon, 27 August 2012 15:08
		Re: A simple DLM question By: Xin Tao on Mon, 27 August 2012 15:04
		Re: A simple DLM question By: Craig Markwardt on Mon, 27 August 2012 13:51
		Re: A simple DLM question By: Jim Pendleton on Mon, 27 August 2012 13:48

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