Tell me more ×
Programmers Stack Exchange is a question and answer site for professional programmers interested in conceptual questions about software development. It's 100% free, no registration required.
up vote 2 down vote favorite
1

What do the symbols ⊞ and ⊕ mean? I'm trying to understand them to make an app.

It's on http://en.wikipedia.org/wiki/File:XXTEA.png

http://en.wikipedia.org/wiki/File:XXTEA.png

share|improve this question
1  
From the context it is obvious that the squared + is simply an addition. – SK-logic Mar 13 '11 at 16:54

1 Answer

up vote 5 down vote accepted

I know for a fact that ⊕ means XOR, or eXclusive OR. With the variables A and B, Normal OR will return true if

  • A=true and b=false
  • A=false and B=true
  • A=true and B=true

XOR on the other hand returns true only if

  • A=false and B=true
  • A=true and B=false

I'm not too sure about ⊞ though. In Unicode its under "SQUARED PLUS", but I don't know how that works in an algorithm

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.