Note: The answers were given in a specific order, but since many users sort answers according to votes, rather than the time they were given, here’s an index of the answers in the order in which they make the most sense: The General Syntax of operator overloading in C++ The Three Basic Rules of Operator … Read more
If Python doesn’t have a ternary conditional operator, is it possible to use other language constructs to simulate one? 3 31 Yes, It was added in version 2.5. The expression syntax is: a if condition else b First condition is evaluated, then exactly one of either a or b is evaluated and returned based on … Read more
Until today, I thought that for example: i += j; Was just a shortcut for: i = i + j; But if we try this: int i = 5; long j = 8; Then i = i + j; will not compile but i += j; will compile fine. Does it mean that in fact … Read more
I saw some code that seems to use an operator I don’t recognize, in the form of two exclamation points, like so: !!. Can someone please tell me what this operator does? The context in which I saw this was, this.vertical = vertical !== undefined ? !!vertical : this.vertical; 3 39
What is this? This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list. Why is this? It used to be hard to find questions about operators and other syntax tokens.¹ The main … Read more
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. I’m using JSLint to go through JavaScript, and it’s returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype.value.length == 0 inside … Read more
After reading Hidden Features and Dark Corners of C++/STL on comp.lang.c++.moderated, I was completely surprised that the following snippet compiled and worked in both Visual Studio 2008 and G++ 4.4. Here’s the code: #include <stdio.h> int main() { int x = 10; while (x –> 0) // x goes to 0 { printf(“%d “, x); … Read more
Java does have a logical XOR operator, it is ^ (as in a ^ b). Apart from that, you can’t define new operators in Java. Edit: Here’s an example: public static void main(String[] args) { boolean[] all = { false, true }; for (boolean a : all) { for (boolean b: all) { boolean c = a ^ b; System.out.println(a … Read more
What does “|=” mean? (pipe equal operator)
The difference between += and =+
