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

It is my implementation on Python. It works well, when we know the number of bytes(or bits).

def summ(a, b):
    #for 4 bytes(or 4*8 bits)
    max_num = 0xFFFFFFFF
    while a != 0:
        a, b = ((a & b) << 1),  (a ^ b)
        if a > max_num:
            b = (b&max_num) 
            break
    return b