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

Was working on this problem myself in C# and couldn't get all test cases to pass. I then ran across this.

Here is an implementation in C# 6:

public int Sum(int a, int b) => b != 0 ? Sum(a ^ b, (a & b) << 1) : a;