371. Sum of integers

Source: Internet
Author: User

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

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

Idea: Xor adds the CArray Sum,and left one is carry, and the two add up.

11 + 11

11^11=00, (11&11) <<1=110


Then summarize some common uses of bit.

Refer to discussion and realize it again!

 Public class Solution {    publicint getsum (intint  b) {        if (b==0)        {            return  A;        }         int sum=a^b;         int carry=a&b;         return getsum (sum,carry<<1);}    }

371. Sum of integers

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