[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.

Code

Java

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