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Is the size of C “int” 2 bytes or 4 bytes?
...ote that the standard encourages us to consider choosing our integer types based on range rather than size, but for now let's ignore the standard practice, and let our curiosity explore sizeof, bytes and CHAR_BIT, and integer representation... let's burrow down the rabbit hole and see it for ourselv...
how to check the dtype of a column in python pandas
...select_dtypes('bool'). It may be used even for selecting groups of columns based on dtype:
test = pd.DataFrame({'bool' :[False, True], 'int64':[-1,2], 'int32':[-1,2],'float': [-2.5, 3.4],
'compl':np.array([1-1j, 5]),
'dt' :[pd.Timestamp('2013-01-02'), pd....
How to use http.client in Node.js if there is basic authorization
...c in this case and the username:password combination which gets encoded in Base64:
var username = 'Test';
var password = '123';
var auth = 'Basic ' + Buffer.from(username + ':' + password).toString('base64');
// new Buffer() is deprecated from v6
// auth is: 'Basic VGVzdDoxMjM='
var header = {'Ho...
Rounding up to next power of 2
...
Check the Bit Twiddling Hacks. You need to get the base 2 logarithm, then add 1 to that. Example for a 32-bit value:
Round up to the next highest power of 2
unsigned int v; // compute the next highest power of 2 of 32-bit v
v--;
v |= v >> 1;
v |= v >> 2;
v ...
How to check the version before installing a package using apt-get?
...14dfcf8b716bad4e6d04ad8452fe1627d
Description-en: Persistent key-value database with network interface
Redis is a key-value database in a similar vein to memcache but the dataset
is non-volatile. Redis additionally provides native support for atomically
manipulating and querying data structures s...
C# - how to determine whether a Type is a number
...
How can you downvote me on an answer based on current technology. Maybe in .NET 62, int will be removed - are you going to downvote all answers with int?
– Philip Wallace
Nov 27 '09 at 19:09
...
How to get started with developing Internet Explorer extensions?
... hand;' onclick='javascript:FncAddedByAddon()' title='Click to open script based alert window.'>" + TextToHighlight + "</span>");
var newNode = document2.createElement("span");
newNode.innerHTML = newText;
d...
How to set the authorization header using curl
...ion used in HTTP (which is the type curl uses by
default) is plain text based, which means it sends username and password
only slightly obfuscated, but still fully readable by anyone that sniffs on
the network between you and the remote server.
To tell curl to use a user and password f...
Why are floating point numbers inaccurate?
...ould like to stress how much the representation of a number depends on the base you are working in.
Consider the fraction 2/3
In good-ol' base 10, we typically write it out as something like
0.666...
0.666
0.667
When we look at those representations, we tend to associate each of them with the ...
重构理论及实践——用工厂模式重构c++后台代码 - C/C++ - 清泛网 - 专注C/C...
...到本例，从可维护性的角度，消息cmd和processor factory是硬编码耦合的，当前情况下没什么问题，但脑洞开一点，业务规模增加到足够大时，框架和消息可能由两拨人来维护，此时是不是用注册回调的观察者模式，可以使业务的人...