What is the best way to add two numbers without using the + operator?

Question

A friend and I are going back and forth with brain-teasers and I have no idea how to solve this one. My assumption is that it\'s possible with some bitwise operators, but n

Answer 1

Here's a portable one-line ternary and recursive solution.

int add(int x, int y) {
    return y == 0 ? x : add(x ^ y, (x & y) << 1);
}