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Re: ishft(-32768,-1) = 2147467264 ? [message #9338]

Fri, 20 June 1997 00:00

George McCabe
Messages: 23
Registered: June 1997

Junior Member

mail message quoted below >>>

On Thu, 19 Jun 1997, George McCabe wrote:

> Is it true that IDL interprets the explicitly typed fix(-32768) as a
> negative constant and not as an operator and an unsigned constant?

I guess I have no way of knowing for sure, but what I'd say is that
when parsing "fix(-32768)" IDL says to itself...

i) Hmm, "32768"... that can't be an ordinary integer, so I'll
make it a long.

ii) There's the unary operator "-", so I'll change the sign.
(value is still a long).

iii) Look here, it's a call to FIX, i.e., a request to convert to
an ordinary integer. The argument is a value I can map into the
set of integers, so I'll do that.

Hope this helps

Stephen Ritcey (902)494-3313 (voice) (902)494-5191 (fax)
Physics Dept., Dalhousie Univ., Halifax, N.S., Canada B3H 3J5

end of quoted message <<<

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George McCabe (HSTX) NASA / GSFC
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E-mail: george.mccabe@gsfc.nasa.gov Greenbelt, MD 20912

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		Re: ishft(-32768,-1) = 2147467264 ? By: George McCabe on Fri, 20 June 1997 00:00
		Re: ishft(-32768,-1) = 2147467264 ? By: George McCabe on Fri, 20 June 1997 00:00
		Re: ishft(-32768,-1) = 2147467264 ? By: George McCabe on Thu, 19 June 1997 00:00

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