如何简化if语句？

Question

How can I simplify if statement like this

!(!a || b) ?

And why it is actually possible?

UPD:

Sorry. Not optimize, but simplify :)

Answer 1

Based on De Morgan's Law your condition !(!a || b) can be simplified like (a && !b)

cause negataion mark as !

!(!a) will become a

!(||) will become &&

!(b) will become !b

Answer 2

You can simplify it a little more by applying De Morgan's laws :

a && !b

… But I wouldn't call it "optimizing"! Really, it's such a tiny expression that you won't get any performance improvements by "optimizing" it (assuming that you're interested in performance improvements) - profile first and find the performance hotspots elsewhere. Or better yet, clarify what do you understand by "optimizing" , what's your definition for it.

UPDATE

OK, it was simplifying the expression what you intended all along. Then stick to the first paragraph of my answer.

Answer 3

According to the De Morgan theorem it could be (a && !b) . Not sure if it makes any difference as you haven't specified what optimization you are looking for.