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Re: assignment inside boolean expression [message #20709 is a reply to message #20613]

Tue, 18 July 2000 00:00

Martin Schultz
Messages: 515
Registered: August 1997

Senior Member

Patrick Broos wrote:
>
> I was wondering if it's common knowlege that one can put an IDL
> assignment inside
> a boolean expression (like in the C language). For example
>
> if (v = 0) then ... assigns v and does not execute the "then"
> statement, while
> if (v = 1) then ... assigns v and does execute the then.
>
> Just as in C I find this leads to really nasty bugs.
>
> --

One application where I am actually using this is token search in
strings. It
can save you a few keystrokes and (in my opinion) make code more
readable, because
the temporary variable p is only used within the IF construct:

if ((p=StrPos(test,'Martin')) ge 0) then $
tail = StrMid(test,p,999)

as opposed to

p = StrPos(test,'Martin')
if p ge 0 then tail = StrMid(test,p,999)

--
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
[[ Dr. Martin Schultz Max-Planck-Institut fuer Meteorologie [[
[[ Bundesstr. 55, 20146 Hamburg [[
[[ phone: +49 40 41173-308 [[
[[ fax: +49 40 41173-298 [[
[[ martin.schultz@dkrz.de [[
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[

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[Message index]

		assignment inside boolean expression By: Patrick Broos on Mon, 10 July 2000 00:00
		Re: assignment inside boolean expression By: Martin Schultz on Tue, 18 July 2000 00:00
		Re: assignment inside boolean expression By: Martin Schultz on Tue, 18 July 2000 00:00

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