LeetCode371——Sum of Two Integers（不用+）

class Solution {public:    int getSum(int a, int b) {        int sum = a;                while (b != 0)        {            sum = a ^ b;//calculate sum of a and b without thinking the carry             b = (a & b) << 1;//calculate the carry            a = sum;//add sum(without carry) and carry        }                return sum;    }};