371. Sum of Two Integers

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.

 

java:

public class Solution {
    public int getSum(int a, int b) {
        int temp = a & b ;
        if (temp == 0)
            return a ^ b ;
        else
            return getSum(temp<<1,a^b) ; 
    }
}