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.



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