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How does the bitwise complement operator (~ tilde) work?
...ple, here's the representation of -2 in two's complement: (8 bits)
1111 1110
The way you get this is by taking the binary representation of a number, taking its complement (inverting all the bits) and adding one. Two starts as 0000 0010, and by inverting the bits we get 1111 1101. Adding one gets u...
MySQL - Using COUNT(*) in the WHERE clause
...
try this;
select gid
from `gd`
group by gid
having count(*) > 10
order by lastupdated desc
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passport.js RESTful auth
...
+50
There are many questions asked here, and it seems that even though the questions are asked in the context of Node and passport.js the ...
For every character in string
...fashioned for-loop:
std::string str = ???;
for(std::string::size_type i = 0; i < str.size(); ++i) {
do_things_with(str[i]);
}
Looping through the characters of a null-terminated character array:
char* str = ???;
for(char* it = str; *it; ++it) {
do_things_with(*it);
}
...
WinDbg基础资料（日本語） - IT优秀资料 - 清泛网 - 专注C/C++及内核技术
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③ Get Call Stack
(Signal Thread)
k
kv
kd
(Multi Thread)
~* k
~0s Set Current Thread，0はThread No.である、変数
④引き続き実行
(Signal Thread)
g
(Multi Thread)
~* g
⑤Get .Net Call Stack
.load C:\Windows\Microsoft.NET\Framework\v2.0.50727\SOS.dll
.l...
In Python how should I test if a variable is None, True or False
...
120
Don't fear the Exception! Having your program just log and continue is as easy as:
try:
re...
Add an element to an array in Swift
...o insert a new element into your Array.
anArray.insert("This String", at: 0)
To insert the contents of a different Array into your Array.
anArray.insert(contentsOf: ["Moar", "Strings"], at: 0)
More information can be found in the "Collection Types" chapter of "The Swift Programming Language", ...
How do I center floated elements?
...gination a {
- display: block;
+ display: inline-block;
width: 30px;
height: 30px;
- float: left;
margin-left: 3px;
background: url(/images/structure/pagination-button.png);
}
(remove the lines starting with - and add the lines starting with +.)
.pagination {
...
Drawing an SVG file on a HTML5 canvas
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EDIT Dec 16th, 2019
Path2D is supported by all major browsers now
EDIT November 5th, 2014
You can now use ctx.drawImage to draw HTMLImageElements that have a .svg source in some but not all browsers. Chrome, IE11, and Safari work, Firefox wo...
count the frequency that a value occurs in a dataframe column
...['freq'] = df.groupby('a')['a'].transform('count')
df
Out[41]:
a freq
0 a 2
1 b 3
2 s 2
3 s 2
4 b 3
5 a 2
6 b 3
[7 rows x 2 columns]
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