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Using scanf() in C++ programs is faster than using cin?
I don't know if this is true, but when I was reading FAQ on one of the problem providing sites, I found something, that poke my attention:
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Which one will execute faster, if (flag==0) or if (0==flag)?
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I haven't seen any correct answer yet (and there are already some) caveat: Nawaz did point out the user-defined trap. And I regret my hastily cast upvote on "stupidest question" because it seems that many did not get it right and it gives room for a nice discussion on compiler op...
do {…} while(false)
...he function exits.
It can make a tiresome if/else-if tree a lot easier to read, by just having to break whenever an exit point is reached, with the rest of the logic inline afterwards.
This pattern is also useful in languages that don't have a goto statement. Perhaps that's where the original prog...
How does this site infecting script work?
...answering the question but still +1, as this was indeed a very interesting read and good suggestions made. Ta
– Peter Perháč
Jan 22 '10 at 23:48
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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...r the cases when an approximation suffices, but speed is required. If you read Intel's documentation, you will also find an instruction sequence (reciprocal square-root approximation followed by a single Newton-Raphson step) that gives nearly full precision (~23 bits of accuracy, if I remember prop...
Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
POSIX allows mutexes to be recursive. That means the same thread can lock the same mutex twice and won't deadlock. Of course it also needs to unlock it twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be P...
How do I serialize an object and save it to a file in Android?
...s = new ObjectInputStream(fis);
SimpleClass simpleClass = (SimpleClass) is.readObject();
is.close();
fis.close();
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XML attribute vs XML element
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I read through some of the answers and something that wasn't stressed enough form my experience is that if you data in an "attribute" and suddenly has a > or < you XML document will break I think there are five ascii char...
IsNothing versus Is Nothing
...ng' rather than "Not IsNothing(object)" which I personally feel looks more readable.
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Is it bad practice to return from within a try catch finally block?
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No, it's not a bad practice. Putting return where it makes sense improves readability and maintainability and makes your code simpler to understand. You shouldn't care as finally block will get executed if a return statement is encountered.
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