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How is a CRC32 checksum calculated?
...ncomplete: temp and testcrc are not declared, so it's unclear what's being indexed, and how much data is running through the algorithm.
The way to understand CRCs is to try to compute a few using a short piece of data (16 bits or so) with a short polynomial -- 4 bits, perhaps. If you practice this...
Are tuples more efficient than lists in Python?
...external array of pointers.
This gives tuples a small speed advantage for indexed lookups and unpacking:
$ python3.6 -m timeit -s 'a = (10, 20, 30)' 'a[1]'
10000000 loops, best of 3: 0.0304 usec per loop
$ python3.6 -m timeit -s 'a = [10, 20, 30]' 'a[1]'
10000000 loops, best of 3: 0.0309 usec per ...
How do negative margins in CSS work and why is (margin-top:-5 != margin-bottom:5)?
...h box 3 up, so it's rendered on top of (or underneath, depending on the z-index) any preceding elements. even if performance wasn't an issue, moving all elements up could mean shifting them out of the viewport, thus the current scrolling position would have to be altered to have everything visible ...
Android preferences onclick event
...o use onPreferenceTreeClick event.
For example see http://www.javased.com/index.php?source_dir=platform_packages_apps_phone/src/com/android/phone/MobileNetworkSettings.java
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
/**...
Handling warning for possible multiple enumeration of IEnumerable
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It's a shame .NET doesn't have an interface that is IEnumerable + Count + Indexer, without Add/Remove etc. methods, which is what I suspect would solve this problem.
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How can I measure the speed of code written in PHP? [closed]
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If you want to quick test performance of a framework, you can put in index.php file
//at beginning
$milliseconds = round(microtime(true) * 1000);
//and at the end
echo round(microtime(true) * 1000) - $milliseconds;
Every time you will get execution time in milliseconds. Because microsecond...
Can you do this HTML layout without using tables?
...ake the container of them both {overflow:hidden}.
That should avoid the z-index problem, anyway. If it doesn't work, and you really need the IE5 support, go ahead and use the table.
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What is the difference between #include and #include “filename”?
...unix archive), and used the string between the < and > as the key to index into the library.
– Adrian McCarthy
Feb 15 '17 at 23:14
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How to do a git diff on moved/renamed file?
... Detect renames. If n is specified, it is a threshold on the similarity index
(i.e. amount of addition/deletions compared to the file’s size). For example,
-M90% means git should consider a delete/add pair to be a rename if more than
90% of the file hasn’t changed.
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How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?
...ly a PK on one table which guarantees uniqueness, but it may need a unique index on the other table.
– HLGEM
Apr 14 '16 at 18:54
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