LeetCode: Sum of Two Integers

LeetCode: 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.

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