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Why don't Java's +=, -=, *=, /= compound assignment operators require casting?
...57
or
byte b = 100;
b /= 2.5;
System.out.println(b); // prints 40
or
char ch = '0';
ch *= 1.1;
System.out.println(ch); // prints '4'
or
char ch = 'A';
ch *= 1.5;
System.out.println(ch); // prints 'a'
share
...
Format date and time in a Windows batch script
...ces with zeros.
Short explanation of how substrings work:
%VARIABLE:~num_chars_to_skip,num_chars_to_keep%
So to get just the year from a date like "29.03.2018" use:
%DATE:~6,4%
^-----skip 6 characters
^---keep 4 characters
...
CSS hexadecimal RGBA?
... = 'rgba(' + matches.slice(1).map(function(m) { return parseInt(m, 16); }).concat(a) + ')';
– PointedEars
Nov 27 '11 at 14:47
...
Find the max of two or more columns with pandas
...DataFrame(np.random.randn(5, 1000))
perfplot.show(
setup=lambda n: pd.concat([df_] * n, ignore_index=True),
kernels=[
lambda df: df.assign(new=df.max(axis=1)),
lambda df: df.assign(new=df.values.max(1)),
lambda df: df.assign(new=np.nanmax(df.values, axis=1)),
...
How do I remove code duplication between similar const and non-const member functions?
...780321334879.
Here's Meyers' solution (simplified):
struct C {
const char & get() const {
return c;
}
char & get() {
return const_cast<char &>(static_cast<const C &>(*this).get());
}
char c;
};
The two casts and function call may be ugly but it's c...
Tab key == 4 spaces and auto-indent after curly braces in Vim
... if I enable expandtab, is there a way to actually input the tab character in the text anyway?
– Daniele Segato
Mar 16 '16 at 10:47
3
...
How exactly does the callstack work?
... pointer arithmetic.
Example
#include <iostream>
int main()
{
char c = std::cin.get();
std::cout << c;
}
gcc.godbolt.org gives us
main:
pushq %rbp
movq %rsp, %rbp
subq $16, %rsp
movl std::cin, %edi
call std::basic_istream<char, std::cha...
Scanner vs. BufferedReader
As far I know, the two most common methods of reading character-based data from a file in Java is using Scanner or BufferedReader . I also know that the BufferedReader reads files efficiently by using a buffer to avoid physical disk operations.
...
To prevent a memory leak, the JDBC Driver has been forcibly unregistered
...(SQLException ex) {
logger.info("Could not deregister driver:".concat(ex.getMessage()));
}
// 3. For added safety, remove the reference to dataSource for GC to enjoy.
dataSource = null;
}
}
Please feel free to comment and/or add...
...
vs vs for inline and block code snippets
...ce: (ctrl-U) looks good preceed every line below with %0A)
data:text/html;charset=utf-8,<html >
<script>document.write(window.navigator.userAgent)</script>
<script></script>
<style>
codenza, code {} /* noop mnemonic aide that codenza mimes code tag */
c...