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Should struct definitions go in .h or .c file?
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Private structures for that file should go in the .c file, with a declaration in the .h file if they are used by any functions in the .h .
Public structures should go in the .h file.
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Logout: GET or POST?
This question is not about when to use GET or POST in general; it is about which is the recommended one for handling logging out of a web application. I have found plenty of information on the differences between GET and POST in the general sense, but I did not find a definite answer for this parti...
What's the difference between deadlock and livelock?
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Taken from http://en.wikipedia.org/wiki/Deadlock:
In concurrent computing, a deadlock is a state in which each member of a group of actions, is waiting for some other member to release a lock
A livelock is similar to a deadlock,
except that the states of ...
Git: How to remove file from index without deleting files from any repository
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I do not think a Git commit can record an intention like “stop tracking this file, but do not delete it”.
Enacting such an intention will require intervention outside Git in any repositories that merge (or rebase onto) a commit that deletes the file.
S...
Why does Math.floor return a double?
Official Javadoc says that Math.floor() returns a double that is "equal to a mathematical integer", but then why shouldn't it return an int ?
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Array versus linked-list
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It's easier to store data of different sizes in a linked list. An array assumes every element is exactly the same size.
As you mentioned, it's easier for a linked list to grow organically. An array's size needs to be known ahead of time, or ...
Ruby, Difference between exec, system and %x() or Backticks
...am. You have to provide the command as a string argument to this method. For example:
>> system("date")
Wed Sep 4 22:03:44 CEST 2013
=> true
The invoked program will use the current STDIN, STDOUT and STDERR objects of your Ruby program. In fact, the actual return value is either true, f...
Check whether a string is not null and not empty
...amp;& !str.isEmpty())
Be sure to use the parts of && in this order, because java will not proceed to evaluate the second part if the first part of && fails, thus ensuring you will not get a null pointer exception from str.isEmpty() if str is null.
Beware, it's only available s...
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
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图2
4、EAX=0：获取CPU的Vendor ID
Vendor ID这个东西，在以前介绍PCI的文章中应该介绍过，实际上就是制造商的标识，用下面的方法执行该功能：
mov eax, 0
cpuid
执行CPUID指令后，AX中返回的...
How to print a string in fixed width?
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EDIT 2013-12-11 - This answer is very old. It is still valid and correct, but people looking at this should prefer the new format syntax.
You can use string formatting like this:
>>> print '%5s' % 'aa'
aa
>>> print '%5s' % 'aaa'
aaa
>>> print '%5s' % 'aaaa'...