Boolean

Given an arbitrary list of booleans, what is the most elegant way of determining that *exactly* one of them is true? The most obvious hack is type conversion: converting them to `0` for `false`... more

What is the simplest way to do a three-way exclusive OR? In other words, I have three values, and I want a statement that evaluates to true IFF only *one* of the three values is true. So far,... more

How should I go about getting a bool value that I can assign true, false and nil to in Objective-C? What is the Objective-C way of doing this? Much like C#'s Nullable<bool>. I'm looking to... more

I have several bool elements and I am checking it if returns me false. bool i = false; switch (idcount) { case 1: i = p1(); break; case 2: i = p1() & p2(); break; case 3: i = p1() &... more

I'm building a PHP class with a private member function that returns a string value such as: 'true && true || false' to a public member function. (This string is the result of some regex... more

Maybe this is just obvious to everyone but can someone explain where XOR (or Exclusive-OR) got its name from? What does the word ***Exclusive*** really mean? Not that it matters, but its just stuck... more

Is there a way I could be able to click a Button and then once the button has been clicked it would be Unable to be clicked until the Form reset itself. Say... Enabling Auto-Save and can't be... more

Let's take a simple example of an object `Cat`. I want to be sure the "not null" `cat` is either orange or grey. if(cat != null && cat.getColor() == "orange" || cat.getColor() == "grey")... more

In many mainstream programming languages you can use Boolean data-type (for instance, value can be either `true` or `false`) - to represent binary "true/false". Is there a Boolean data-type in SAS... more