| Re: Interpreter stack not aligned properly during user return. [message #38597 is a reply to message #38429] |
Fri, 12 March 2004 08:40   |
![Stein Vidar Hagfors H[2] is currently offline](theme/default/images/xoffline.png.pagespeed.ic.XRkd1fkXye.png "Stein Vidar Hagfors H[2] is currently offline")
Stein Vidar Hagfors H[2]
Messages: 28
Registered: October 2002
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Junior Member |
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David Fanning <david@dfanning.com> writes:
> Craig Markwardt writes:
>
>>> The lesson is, of course, don't use unnecessary parentheses! To decide
>>> which parentheses are actually necessary when using pointers, arrays, and
>>> structures together, you could consult the operator precedence tutorial.
>>
>> ...or get addicted to crack cocaine. That seems easier and produces
>> the same effect. :-)
>
> That's what I was thinking, too, but I couldn't tell
> if my eyes were blurring from tiredness or just the
> effort to keep all those parentheses straight when
> I had a pointer to a structure that had a pointer....
>
> Oh, my God, I'm dizzy again!
Not to mention the *HORRIBLE* fact I discovered (the hard way) not too
long ago, that IDL goes against all common sense putting AND and OR on
equal footing wrt precedence:
IDL> print, 1 or 0 and 0
0
IDL> print, 1 or (0 and 0)
1
Yikes!!! I've used IDL for sooo many years, and heaven knows how many
statements of the form "a OR b AND c" there are in my programs,
causing unintended results! IMO they might as well abandon the whole
idea of operator precedence, switching to a clearly stated, randomized
evaluation approach. That way, everybody would know that you'd better
put in every darn parenthesis that you *think* is superfluous.
--
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Stein Vidar Hagfors Haugan
ESA SOHO SOC/European Space Agency Science Operations Coordinator for SOHO
NASA Goddard Space Flight Center, Tel.: 1-301-286-9028
Mail Code 682.3, Bld. 26, Room G-1, Cell: 1-240-354-6066
Greenbelt, Maryland 20771, USA. Fax: 1-301-286-0264
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