Why is 2 + 1 & 0 the result is 0?

Question

In VC2008, I typed this code:

int a = 2 + 1 & 0; 

and this expression is obtained a = 0

Why is the result equal to 0 but not 2?

Answer 1

Since the operator & is evaluated after the operator + and 3 & 0 is 0 .

Of course, you can put braces around expressions to change the order of evaluation. For instance:

 int a = 2 + (1 & 0); /* a == 2 */ 

Answer 2

+ has a higher priority than & . Here is a complete table of operator priorities.