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Is char signed or unsigned by default?
...d.
Do note that char is special in this way. If you declare a variable as int it is 100% equivalent to declaring it as signed int. This is always true for all compilers and architectures.
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i...
return statement vs exit() in main()
...h the standard
library. To illustrate (in C++),
this is a valid program:
int main() { return 0; }
but to use exit you'll need an include:
#include <stdlib.h>
int main() { exit(EXIT_SUCCESS); }
Plus this adds an additional assumption: that calling exit from main has the same side effects...
Generate random string/characters in JavaScript
...tring method of a number type in javascript takes an optional parameter to convert the number into a given base. If you pass two, for example, you'll see your number represented in binary. Similar to hex (base 16), base 36 uses letters to represent digits beyond 9. By converting a random number to b...
In STL maps, is it better to use map::insert than []?
...) will only create:
using std::cout; using std::endl;
typedef std::map<int, std::string> MyMap;
MyMap map;
// ...
std::pair<MyMap::iterator, bool> res = map.insert(MyMap::value_type(key,value));
if ( ! res.second ) {
cout << "key " << key << " already exists "
...
What's the best way to iterate over two or more containers simultaneously
...range: a function with one line of code is all I need. However, I would be interested if the performance of boost ranges is optimal as well.
– SebastianK
Nov 6 '14 at 15:45
...
Why do I need to override the equals and hashCode methods in Java?
...therField() {
return anotherField;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((importantField == null) ? 0 : importantField.hashCode());
return result;
}
@Override
...
Insert auto increment primary key to existing table
... an primary key column but I was wondering if it's possible to insert data into the primary key column automatically (I already have 500 rows in DB and want to give them id but I don't want to do it manually). Any thoughts? Thanks a lot.
...
How do I get the current line number?
...oo");
}
...
static void ShowMessage(string message,
[CallerLineNumber] int lineNumber = 0,
[CallerMemberName] string caller = null)
{
MessageBox.Show(message + " at line " + lineNumber + " (" + caller + ")");
}
This will display, for example:
Boo at line 39 (SomeMethodSomewhere)
Ther...
How to document a string type in jsdoc with limited possible values
...on of the tooltip
* @param {String='up','down','left','right'} position pointer position
*/
setPosition(position='left'){
// YOUR OWN CODE
}
Oh yeah, I'm using ES6.
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Preferred Java way to ping an HTTP URL for availability
...way is using java.net.Socket.
public static boolean pingHost(String host, int port, int timeout) {
try (Socket socket = new Socket()) {
socket.connect(new InetSocketAddress(host, port), timeout);
return true;
} catch (IOException e) {
return false; // Either timeout ...