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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public class Solution {public int GetSum(int a, int b) {int sum = 0;while (b != 0) {sum = a ^ b;b = (a & b) << 1;a = sum;}return sum;}}
371.用位运算实现加法 Sum of Two Integers
原文：http://www.cnblogs.com/xiejunzhao/p/2a2e6114090553da472fb3e2c48f2904.html