src/main/java/com/fishercoder/solutions/_371.java

package com.fishercoder.solutions;

public class _371 {

    public static class Solution1 {
        /**
         * reference: http://stackoverflow.com/questions/9070937/adding-two-numbers-without-operator-clarification
         */
        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);
        }
    }
}