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Re: Case statement question [message #42819 is a reply to message #42818]

Wed, 23 February 2005 08:31

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Benjamin Hornberger wrote:
> Michael Wallace wrote:
>
>> case x of
>> 0: do_this()
>> 1: do_that(x)
>> 2: do_that(x)
>> 3: do_that(x)
>> 4: do_that(x)
>> 5: do_that(x)
>> 6: do_that(x)
>> 7: do_that(x)
>> 8: do_that(x)
>> 9: do_that(x)
>> 10: do_something_else()
>> 11: do_something_more()
>> endswitch
>>
>> Is there a way to group 1 - 9 into a single expression rather than
>> having to list each distinct number in the range?
>>
>> -Mike
>
>
> How about
>
> switch x of
> 0: do_this() & break
> 1:
> 2:
> ...
> 9: do_that() & break
> 10: do_something_else() & break
> 11: do_something_more() & break
> else: whatever()
> endswitch

Oooo - I prefer this to the solution I posted. Looks cleaner. Of course, I prefer the
Fortran solution above all:

SELECT CASE (x)
CASE (0); do_this()
CASE (1:9); do_that(x)
CASE (10); do_something_else()
CASE (11); do_something_more()
CASE DEFAULT; whatever()
END SELECT

And you can do stuff like
CASE (:-1)
to specify any negative numbers or
CASE (1:)
to specify any positive numbers. And multiple single/ranges too:
CASE (1, 3, 7:10, 13, 15:20)

Very bloody handy.

Personally I think IDL should've used different syntax for the CASE/SWITCH constructs. I
would prefer something more like the Fortran example above:

case x of
0) do_this()
1:9) do_that(x)
10) do_something_else()
11) do_something_more()
else) whatever()
endcase

so you could use ":" to specify ranges.

paulv

--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC

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[Message index]

		Re: Case statement question By: Mark Hadfield on Wed, 23 February 2005 12:11
		Re: Case statement question By: R.G.Stockwell on Wed, 23 February 2005 09:19
		Re: Case statement question By: Paul Van Delst[1] on Wed, 23 February 2005 08:32
		Re: Case statement question By: Paul Van Delst[1] on Wed, 23 February 2005 08:31
		Re: Case statement question By: Mark Hadfield on Tue, 22 February 2005 15:57
		Re: Case statement question By: Benjamin Hornberger on Tue, 22 February 2005 15:51
		Re: Case statement question By: Michael Wallace on Tue, 22 February 2005 15:50
		Re: Case statement question By: Michael Wallace on Tue, 22 February 2005 15:44
		Re: Case statement question By: David Fanning on Tue, 22 February 2005 15:37
		Re: Case statement question By: Paul Van Delst[1] on Tue, 22 February 2005 15:35

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