Question

I need to know how the logical AND an OR operators are evaluated in a statement. I have found a few sites that try to explain it but I can’t make heads nor tails of them. I know I can use braces to order it how I want but i’d like to understand how it works.

for example would

if( b1 && b2 || b3 )

be evaluated as:

(b1 && b2) || b3 

or as:

b1 && (b2 || b3)

Answer 1

You can find in any operator precedence table that && has higher precedence than ||, which means it’s evaluated as

(b1 && b2) || b3 

Note though that both && and || are short-circuiting, which means that b2 and b3 don’t have to be evaluated. For example, if b1 evaluates to false, b2 will not be evaluated at all. Also, if b1 && b2 evaluates to true, b3 won’t be evaluated.