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(!( && !

Tazel · 2003-01-28T21:17:42

Do these things mean the same thing: if(!(blah)) return(0); and if(!blah) return(0); BTW, if(blah) is checking whether or not blah is existant? [edited by - Tazel on January 28, 2003 4:46:18 PM]

General and Gameplay Programming Programming

Started by Tazel January 28, 2003 03:43 PM

13 comments, last by Tazel 21 years, 2 months ago

aftermath

100

January 28, 2003 05:57 PM

the parens tell the operand ( ''!'' in this case ) what context to evaluate.

Rate me up.

felisandria

739

January 28, 2003 06:09 PM

You understand Order of Operations, right Tazel? You know that

2 + 1 * 6 is different than
(2 + 1) * 6 ?

We just added some more operations into the order of operations, that you might not be used to. So, when in doubt, use more parenthesis. Or look up "operator precedence" and see what tier it''s on.

-fel

~ The opinions stated by this individual are the opinions of this individual and not the opinions of her company, any organization she might be part of, her parrot, or anyone else. ~

Thunder_Hawk

314

January 28, 2003 06:26 PM

This is why, if you feel the need to use macros, you must make liberal use of parentheses in the macro if it starts to gain much any kind of complexity, unless it''s the intended behaviour.

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Stoffel

250

January 28, 2003 06:42 PM

!(a && b) is equivalent to (!a || !b)

Knowing a little boolean logic can get you pretty far in programming. Example:

(a || (!a && b)) is equivalent to (a || b), and easier to read if using long variable names.

T h i n k L i b e r a l l y ..

Tazel

122

Author

January 28, 2003 09:17 PM

Fel: Yes. The parentheses and any grouping symbol''s contents are evaluated first.

Then powers.

Then multiplication and division from left to right.

Then add. and sub. from left to right.

tcache
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(!( && !

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(!( && !

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