9 Answered Questions for the topic Boolean

Boolean Logic

07/13/19

#### How do I determine if *exactly* one boolean is true, without type conversion?

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

07/06/19

#### XOR of three values?

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

06/27/19

#### What is the Objective-C way of getting a nullable bool?

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...
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#### Check severeal boolean returns in same time?

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() &...
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#### How to parse a string of boolean logic in PHP?

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...
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#### What does Exclusive in XOR really mean?

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...
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04/14/19

#### In Java, what are the boolean "order of operations"?

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")...
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04/12/19

#### How to use Boolean datatype in SAS?

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...
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