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In C/C++ what's the simplest way to reverse the order of bits in a byte?
...s to reverse bit order in a byte, I'm curious as to what is the "simplest" for a developer to implement. And by reversing I mean:
...
What is the most efficient way of finding all the factors of a number in Python?
...rs(n):
return set(reduce(list.__add__,
([i, n//i] for i in range(1, int(n**0.5) + 1) if n % i == 0)))
This will return all of the factors, very quickly, of a number n.
Why square root as the upper limit?
sqrt(x) * sqrt(x) = x. So if the two factors are the same, they're ...
What characters do I need to escape in XML documents?
...
If you use an appropriate class or library, they will do the escaping for you. Many XML issues are caused by string concatenation.
XML escape characters
There are only five:
" "
' '
< &lt;
> &gt;
& &amp;
Escaping characters depends on where...
Why should I care that Java doesn't have reified generics?
... is also fine, the above is just an example, also the try-catch is omitted for brevity)
For all other generic type constructs, the actual type can easily be resolved with a bit help of reflection. The below Q&A illustrate the use cases and possibilities:
Get generic type of java.util.List
How...
Mod of negative number is melting my brain
...y position so that it will loop round. Doing i %
arrayLength works fine for positive numbers but for negative numbers it all goes wrong.
...
Deserialize JSON into C# dynamic object?
...uilder sb)
{
var firstInDictionary = true;
foreach (var pair in _dictionary)
{
if (!firstInDictionary)
sb.Append(",");
firstInDictionary = false;
var value = pair.Value;
va...
What is the purpose of the word 'self'?
...o, or perhaps something yet more different -- but it didn't. Python's all for making things explicit, making it obvious what's what, and although it doesn't do it entirely everywhere, it does do it for instance attributes. That's why assigning to an instance attribute needs to know what instance to...
HTTP URL Address Encoding in Java
...help; in the documentation of URL you find
Note, the URI class does perform escaping of its component fields in certain circumstances. The recommended way to manage the encoding and decoding of URLs is to use an URI
Use one of the constructors with more than one argument, like:
URI uri = new ...
Can a C++ enum class have methods?
...
No, they can't.
I can understand that the enum class part for strongly typed enums in C++11 might seem to imply that your enum has class traits too, but it's not the case. My educated guess is that the choice of the keywords was inspired by the pattern we used before C++11 to get sc...
How do I use itertools.groupby()?
...didn't get is that in the example construction
groups = []
uniquekeys = []
for k, g in groupby(data, keyfunc):
groups.append(list(g)) # Store group iterator as a list
uniquekeys.append(k)
k is the current grouping key, and g is an iterator that you can use to iterate over the group defined...