Definition of OR

Definition: OR is an operation between two bits. If either bit is set then the result is set. If both are clear, the result is clear. This can be shown as below.

 A B --- A OR B
 0 0 ----- 0
 0 1 ----- 1
 1 0 ----- 1
 1 1 ----- 1
 

In C, C++ and C# binary OR is represented by a single pipe character |.

In expressions, OR is represented by the double pipe character || as in

 if (a==2) || (a==3) { //.. rest of code 

Which means if a equals 2 or a equals 3

Glossary:

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