A + B Problem.cpp

class Solution {
public:
    /*
     * @param a: The first integer
     * @param b: The second integer
     * @return: The sum of a and b
     */
    int aplusb(int a, int b) {
        // write your code here, try to do it without arithmetic operators.
        if((a&b) == 0) return a|b;
        return aplusb(a^b, ((a&b)<<1));
    }
};