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Why switch is faster than if
... code branch. This runs in O(log n) time, which is still good, but not the best.
For more information on this, see here: Difference between JVM's LookupSwitch and TableSwitch?
So as far as which one is fastest, use this approach:
If you have 3 or more cases whose values are consecutive or nearly c...
Performance of FOR vs FOREACH in PHP
...$x); for ($i=0; $i<$c; $i++) the $i<$c is a bunch of Zend opcodes at best, as is the $i++. In the course of 100000 iterations, this can matter. Foreach knows at the native level what to do. No PHP opcodes needed to test the "am I at the end of this array" condition.
What about the old schoo...
In which order should floats be added to get the most precise result?
...nning totals at different magnitudes, add each new value to the total that best matches its magnitude, and when a running total starts to get too big for its magnitude, add it into the next total up and start a new one. Taken to its logical extreme, this process is equivalent to performing the sum i...
How do you specify the Java compiler version in a pom.xml file?
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Which way is "best"? This one is less verbose compared to the selected answer, but it seems sort of hidden. Even the Maven site documentation shows using the plugin.
– mkobit
Oct 15 '15 at 16:34
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Why does changing 0.1f to 0 slow down performance by 10x?
...d the Internet for ways of killing denormal numbers, it seems there is no "best" way to do this yet. I have found these three methods that may work best in different environments:
Might not work in some GCC environments:
// Requires #include <fenv.h>
fesetenv(FE_DFL_DISABLE_SSE_DENORMS_ENV)...
Why use pointers? [closed]
...t element by incrementing the pointer (to the next address location).
The best explanation of pointers and pointer arithmetic that I've read is in K & R's The C Programming Language. A good book for beginning learning C++ is C++ Primer.
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Switch statement fallthrough in C#?
...creation of any programming language is therefore a balance between how to best serve these two goals. On the one hand, the easier it is to turn into computer instructions (whether those are machine code, bytecode like IL, or the instructions are interpreted on execution) then more able that process...
How to configure MongoDB Java driver MongoOptions for production use?
I've been searching the web looking for best practices for configuring MongoOptions for the MongoDB Java driver and I haven't come up with much other than the API. This search started after I ran into the "com.mongodb.DBPortPool$SemaphoresOut: Out of semaphores to get db
connection" error and by in...
What is the effect of extern “C” in C++?
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Best answer since you 1) explicitly mention that extern "C" { helps you call unmangled C functions from within C++ programs, as well as unmangled C++ functions from within C programs, which other answers don't make so obvious...
How to securely save username/password (local)?
...using the same computer can't see everyone's personal data.
What is the best/most secure way to save this data?
5 Answ...