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Divide a number by 3 without using *, /, +, -, % operators
.../ 3 = a/4 + a/16 + a/64 + (..). Dividing by 4 is where the bit shift comes from. The last check on num==3 is needed because we've only got integers to work with.
– Yorick Sijsling
Jul 30 '12 at 12:40
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Android Fragment lifecycle over orientation changes
...Be warned though: problems will occur if you try and access Activity Views from inside the Fragment as the lifecycles will subtly change. (Getting Views from a parent Activity from a Fragment isn't easy).
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Placeholder in UITextView
...de a few minor modifications to bcd's solution to allow for initialization from a Xib file, text wrapping, and to maintain background color. Hopefully it will save others the trouble.
UIPlaceHolderTextView.h:
#import <Foundation/Foundation.h>
IB_DESIGNABLE
@interface UIPlaceHolderTextView :...
C dynamically growing array
... shouldn't assume the role of a teacher, for example. I often read answers from those who seemingly don't know how to use realloc (i.e. the currently accepted answer!) telling others how to use it incorrectly, occasionally under the guise that they've omitted error handling, even though this is a co...
Extract TortoiseSVN saved password
...dentials are saved in subdirectories of %APPDATA%\Subversion\auth\. Listed from this previous answer they are:
svn.simple contains credentials for basic authentication (username/password)
svn.ssl.server contains SSL server certificates
svn.username contains credentials for username-only authentica...
Cross-platform way of getting temp directory in Python
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f.seek(0) # return to beginning of file
print f.read() # reads data back from the file
f.close() # temporary file is automatically deleted here
For completeness, here's how it searches for the temporary directory, according to the documentation:
The directory named by the TMPDIR environment va...
Wait for a process to finish
...acOS, for example, implements BSD's kqueue), but not all make it available from command-line.
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How to remove the first character of string in PHP?
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To remove every : from the beginning of a string, you can use ltrim:
$str = '::f:o:';
$str = ltrim($str, ':');
var_dump($str); //=> 'f:o:'
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Iterating C++ vector from the end to the beginning
Is it possible to iterate a vector from the end to the begin?
12 Answers
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What's the longest possible worldwide phone number I should consider in SQL varchar(length) for phon
...e include a source in your answer, so we can go ahead and learn the basics from it.
– Shimmy Weitzhandler
Jul 20 '10 at 18:20
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