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Re: CASE statement [message #26550 is a reply to message #26549]

Fri, 07 September 2001 13:39

Stein Vidar Hagfors H[1] is currently offline

Stein Vidar Hagfors H[1]
Messages: 56
Registered: February 2000

Member

David Fanning <david@dfanning.com> writes:

> K Banerjee (kbanerje2@home.com) writes:
>
>> In IDL, is it possible to use mulitple expressions with a single
>> statement?
>>
>> Something like:
>>
>> PRO CASE1, Tag
>>
>> case Tag of
>>
>> ;; The following line does not work.
>> ('TIFF') or ('tiff'): begin
>> print, "TAG is TIFF"
>> end
>>
>> else: begin
>> print, "TAG is UNKNOWN"
>> end
>>
>> endcase
>>
>> end
>
> No. The proper form of this CASE statement looks
> like this:
>
> CASE StrUpCase(tag) OF
> 'TIFF': Print, 'Tag is TIFF'
> ELSE : Print, 'Tag is Unknown'
> ENDCASE

"The proper form" ?

Well, not that I've ever used it myself, but I have seen another nifty form,
something like this:

case 1 of
(tag eq 'TIFF') or $
(tag eq 'TAFF') or $
(tag eq 'FIFF') : begin & print,"Tag is TIFF (or a typo thereof)" & end

(tag eq 'GIF') or $
(tag eq 'GUF') : begin & print,"Tag is GIF (or a typo thereof)" & end

:

ELSE: print, "Tag is unknown"
end

The "ELSE" part can of course be written like this (saves 3 keystrokes :-)

1: print,"Tag is unknown"

Whether this is a "proper form", I'll leave up to David :-)

--
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Stein Vidar Hagfors Haugan
ESA SOHO SOC/European Space Agency Science Operations Coordinator for SOHO

NASA Goddard Space Flight Center, Email: shaugan@esa.nascom.nasa.gov
Mail Code 682.3, Bld. 26, Room G-1, Tel.: 1-301-286-9028/240-354-6066
Greenbelt, Maryland 20771, USA. Fax: 1-301-286-0264
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[Message index]

		Re: CASE statement By: R.Bauer on Mon, 10 September 2001 04:54
		Re: CASE statement By: Martin Downing on Mon, 10 September 2001 04:45
		Re: CASE statement By: Jeff Guerber on Fri, 07 September 2001 20:18
		Re: CASE statement By: gmccabe14 on Fri, 07 September 2001 18:44
		Re: CASE statement By: Pavel A. Romashkin on Fri, 07 September 2001 16:16
		Re: CASE statement By: Kristian Kjaer on Fri, 07 September 2001 15:17
		Re: CASE statement By: Pavel A. Romashkin on Fri, 07 September 2001 14:30
		Re: CASE statement By: Brian Jackel on Fri, 07 September 2001 14:41
		Re: CASE statement By: David Fanning on Fri, 07 September 2001 14:00
		Re: CASE statement By: Stein Vidar Hagfors H[1] on Fri, 07 September 2001 13:39
		Re: CASE statement By: David Fanning on Fri, 07 September 2001 13:23
		Re: CASE statement By: marc schellens[1] on Wed, 12 September 2001 23:01
		Re: CASE statement By: george.mccabe on Wed, 03 October 2001 11:49

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