LeetCode之Sum of Two Integers

1、题目

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.

Credits:
Special thanks to @fujiaozhu for adding this problem and creating all test cases.

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2、代码实现

public class Solution {    public int getSum(int a, int b) {     while(b != 0)          {              int tmp =(a & b) << 1;             //a是每次相加,相当于和            a = a ^ b;            //b相当于是进位            b = tmp;        }          return a;       }}