Java – why does 10 > > 2 5 > > 2 evaluate to zero?

Consider the following codes:

int a=10,b=5;
int c=a>>2+b>>2;
System.out.println(c);

At run time, the (surprising) output is 0

Why is that?

Solution

Taking into account Java's operator precedence (especially precedence over > >) and association rules, the expression is equivalent to

(a >> (2 + b)) >> 2

or

(10 >> (2 + 5)) >> 2

This is zero

If you need to convert before adding, enclose them:

(a >> 2) + (b >> 2)