371. Sum of Two Integers

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.
https://leetcode.com/problems/sum-of-two-integers/description/
    int getSum(int a, int b) {
        int s = a;
        while(b != 0) {
            s = a ^ b;
            b = (a & b) << 1;
            a = s;
        }
        return s;
    }