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Re: -32768 [message #88104 is a reply to message #88099]

Thu, 20 March 2014 10:01

Karl[1]
Messages: 79
Registered: October 2005

Member

On Thursday, March 20, 2014 3:24:59 AM UTC-6, Rob Klooster wrote:
> The reason it does not work, is that you first try to define +32768 and then negate the result. Since +32768 can only be expressed as a long, you end up with a long variable. Using fix is a solution, but you could also use the bitwise not operator, if you feel adventurous:
>
> IDL> a = not 32767
>
> IDL> help, a
>
> A INT = -32768

And whether this is a "bug" in IDL or not depends on how IDL defines literal constants.

If an IDL (integral) constant has the form (excuse my abuse of regex):

[+-][0-9]*

then one could argue this is be a bug.

If a constant can be only:

[0-9]*

then, the '-' is taken as an operator and this would not be considered an IDL bug.

C allows:

short a = -32768;

but warns about:

short a = -32769;

on a machine where a short is 16 bits.

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[Message index]

		-32768 By: greg.addr on Tue, 18 March 2014 21:43
		Re: -32768 By: skymaxwell@gmail.com on Tue, 18 March 2014 22:02
		Re: -32768 By: Craig Markwardt on Wed, 19 March 2014 12:17
		Re: -32768 By: Rob Klooster on Thu, 20 March 2014 02:24
		Re: -32768 By: Karl[1] on Thu, 20 March 2014 10:01
		Re: -32768 By: Jim Pendleton on Thu, 20 March 2014 14:11
		Re: -32768 By: Yngvar Larsen on Thu, 20 March 2014 14:30
		Re: -32768 By: chris_torrence@NOSPAM on Thu, 20 March 2014 16:44
		Re: -32768 By: Yngvar Larsen on Fri, 21 March 2014 11:02
		Re: -32768 By: Yngvar Larsen on Fri, 21 March 2014 11:04
		Re: -32768 By: Lajos Foldy on Fri, 21 March 2014 11:16
		Re: -32768 By: Yngvar Larsen on Fri, 21 March 2014 11:39
		Re: -32768 By: Lajos Foldy on Fri, 21 March 2014 12:55
		Re: -32768 By: Dick Jackson on Sat, 22 March 2014 13:20
		Re: -32768 By: Lajos Foldy on Sat, 22 March 2014 13:58
		Re: -32768 By: Dick Jackson on Sat, 22 March 2014 16:56

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