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How do malloc() and free() work?
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OK some answers about malloc were already posted.
The more interesting part is how free works (and in this direction, malloc too can be understood better).
In many malloc/free implementations, free does normally not return the memory to the operating system (or at l...
How to import other Python files?
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There are many ways to import a python file, all with their pros and cons.
Don't just hastily pick the first import strategy that works for you or else you'll have to rewrite the codebase later on when you find it doesn't meet your needs.
I'll start out explaining the easiest exampl...
How to change line-ending settings
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Line ending format used in OS
Windows: CR (Carriage Return \r) and LF (LineFeed \n) pair
OSX,Linux: LF (LineFeed \n)
We can configure git to auto-correct line ending formats for each OS in two ways.
Git Global configuration
Use .gitattributes file
...
What does Python's eval() do?
...ing and then have python run it as code. So for example: eval("__import__('os').remove('file')").
– BYS2
Feb 21 '12 at 19:24
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How to run a Python script in the background even after I logout SSH?
... process exits with status 1. What's going on?
– Santosh Ghimire
Dec 7 '13 at 15:03
1
read the ou...
App Inventor 2 列表代码块 · App Inventor 2 中文网
...异常、报错。
如果给定列表是一个二维列表，如 [["abc","123"],["xyz","456"]] ，则返回的列表项也是一个列表对象，如 ["abc","123"]。
求对象在列表中的位置
返回指定对象在列表中的位置，从 1 开始，如果不在列...
Are default enum values in C the same for all compilers?
...tion:
Value of jan will be 0,feb will be 1,mar will be 2.
enum months{jan=123,feb=999,mar}
Explanation:
Value of jan will be 123,feb will be 999,mar will be 1000.
enum months{jan='a',feb='s',mar}
Explanation:
Value of jan will be 'a',feb will be 's',mar will be 't'.
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How to detect Safari, Chrome, IE, Firefox and Opera browser?
...specific instructions to install an extension. Use feature detection when possible.
Demo: https://jsfiddle.net/6spj1059/
// Opera 8.0+
var isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
// Firefox 1.0+
var isFirefox = typeof I...
Which is the preferred way to concatenate a string in Python?
... to a string, then to a list:
a += b:
0.10780501365661621
a.append(b):
0.1123361587524414
OK, turns out that even when the resulting string is a million characters long, appending was still faster.
Now let's try with appending a thousand character long string a hundred thousand times:
a += b:
0...
Eclipse returns error message “Java was started but returned exit code = 1”
... @KadoLakatt: please provide your own answer next time. Edited my post to address your point, though.
– Calon
Feb 26 '15 at 6:51
1
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