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How to count the number of set bits in a 32-bit integer?
...ng-routines/
http://aggregate.ee.engr.uky.edu/MAGIC/#Population%20Count%20(Ones%20Count)
How this SWAR bithack works:
i = i - ((i >> 1) & 0x55555555);
The first step is an optimized version of masking to isolate the odd / even bits, shifting to line them up, and adding. This effectivel...
Renaming files in a folder to sequential numbers
...%04d.jpg" "$a") #04 pad to length of 4
mv -i -- "$i" "$new"
let a=a+1
done
using the -i flag prevents automatically overwriting existing files.
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How do I use a file grep comparison inside a bash if/else statement?
...PE being any command or sequence of commands, then:
if PIPE ; then
# do one thing if PIPE returned with zero status ($?=0)
else
# do another thing if PIPE returned with non-zero status ($?!=0), e.g. error
fi
For the record, [ expr ] is a shell builtin† shorthand for test expr.
Since grep...
How do I give text or an image a transparent background using CSS?
...
In Firefox 3 and Safari 3, you can use RGBA like Georg Schölly mentioned.
A little known trick is that you can use it in Internet Explorer as well using the gradient filter.
background-color: rgba(0, 255, 0, 0.5);
filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColo...
round up to 2 decimal places in java? [duplicate]
I have read a lot of stackoverflow questions but none seems to be working for me. i am using math.round() to round off.
this is the code:
...
Error handling with node.js streams
...you are working in objectMode = true. The callback is called when you are done processing the chunk. This chunk is then pushed on to the next stream.
If you want a nice helper module that will enable you to do through stream really really easily, I suggest through2.
For error handling, keep readi...
Android: Go back to previous activity
...tp://developer.android.com/reference/android/content/Intent.html
As mentioned in the comments, if the activity is opened with startActivity() then one can close it with finish().
If you wish to use the Up button you can catch that in onOptionsSelected(MenuItem item) method with checking the item I...
What is the most efficient way to deep clone an object in JavaScript?
What is the most efficient way to clone a JavaScript object? I've seen obj = eval(uneval(o)); being used, but that's non-standard and only supported by Firefox . I've done things like obj = JSON.parse(JSON.stringify(o)); but question the efficiency. I've also seen recursive copying funct...
An App ID with Identifier '' is not available. Please enter a different string
...fault in Safari. Didn't see that there are more entries... Because all the ones created by Xcode start with XC, they appear at the bottom...
– endavid
Sep 15 '19 at 10:43
...
Ruby: How to post a file via HTTP as multipart/form-data?
...l = true
# for debugging dev server
#n.verify_mode = OpenSSL::SSL::VERIFY_NONE
res = n.start do |http|
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