1、題目

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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、代碼實現

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public class Solution {public int getSum(int a, int b) {while(b != 0) { int tmp =(a & b) << 1; //a是每次相加,相當于和a = a ^ b;//b相當于是進位b = tmp;} return a; } }

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