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How long is the SHA256 hash?
...
A sha256 is 256 bits long -- as its name indicates.
Since sha256 returns a hexadecimal representation, 4 bits are enough to encode each character (instead of 8, like for ASCII), so 256 bits would represent 64 hex characters, therefore you n...
Enum type constraints in C# [duplicate]
... that might have been for Delegate. I'd be happy to experiment with this a bit more (heck, a lot more) if it might mean the restrictions being removed from C# 5. (I assume C# 4 is locked down now.)
– Jon Skeet
Sep 10 '09 at 8:52
...
How do you run your own code alongside Tkinter's event loop?
...roperly and cleanly close when the [X] button was clicked, this along with win32gui.FindWindow(None, 'window title') did the trick! I'm such a noob ;-)
– JxAxMxIxN
Oct 16 '16 at 14:48
...
PHP random string generator
...itive integer");
}
$pieces = [];
$max = mb_strlen($keyspace, '8bit') - 1;
for ($i = 0; $i < $length; ++$i) {
$pieces []= $keyspace[random_int(0, $max)];
}
return implode('', $pieces);
}
Usage:
$a = random_str(32);
$b = random_str(8, 'abcdefghijklmnopqrstuvwxyz')...
Why does Math.round(0.49999999999999994) return 1?
...void print(double d) {
System.out.printf("%016x\n", Double.doubleToLongBits(d));
}
public static void main(String args[]) {
double a = 0.5;
double b = 0.49999999999999994;
print(a); // 3fe0000000000000
print(b); // 3fdfffffffffffff
print(a+b); // 3ff00000000000...
What is the difference between user and kernel modes in operating systems?
...T instructions.
cannot do IO instructions like in and out, and thus have arbitrary hardware accesses.
Otherwise, for example, file permissions would be useless if any program could directly read from disk.
More precisely thanks to Michael Petch: it is actually possible for the OS to allow IO instr...
How can I use PowerShell with the Visual Studio Command Prompt?
...\vc\vcvarsall.bat"
Invokes the vcvarsall.bat file to set up a 32-bit dev environment. All
environment variable changes it makes will be propagated to the current
PowerShell session.
.EXAMPLE
C:\PS> Invoke-BatchFile "$env:VS90COMNTOOLS\..\..\vc\vcvarsall.bat" amd64
I...
What does “dereferencing” a pointer mean?
...example, if the string literal happened to be at address 0x1000 and p a 32-bit pointer at 0x2000, the memory content would be:
Memory Address (hex) Variable name Contents
1000 'a' == 97 (ASCII)
1001 'b' == 98
1002 ...
“:” (colon) in C struct - what does it mean? [duplicate]
...
Those are bit fields. Basically, the number after the colon describes how many bits that field uses. Here is a quote from MSDN describing bit fields:
The constant-expression specifies the width of the field in bits. The
type-spec...
Is it better to use std::memcpy() or std::copy() in terms to performance?
...ays was passed in to the function as a function parameter.
I did a little bit more testing to see what I could do to make std::copy faster again. The answer turned out to be simple: turn on link time optimization. These are my results with LTO turned on (option -flto in gcc):
Time (in seconds) to ...