【LeetCode】 371. Sum of Two Integers

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.

Example:
Given a = 1 and b = 2, return 3.

public class Solution {    public int getSum(int a, int b) {        if (a == 0) {            return b;        }        if (b == 0) {            return a;        }        while (b != 0) {            int carry = a & b;            a = a ^ b;            b = carry << 1;        }        return a;    }}