这是您娱乐的例子

unsigned int myAdd(unsigned int a, unsigned int b)
{
    unsigned int carry = a & b;
    unsigned int result = a ^ b;
    while(carry != 0)
    {
        unsigned int shiftedcarry = carry << 1;
        carry = result & shiftedcarry;
        result ^= shiftedcarry;
    }
    return result;
}

该循环可能会展开。它执行的次数取决于操作数中设置的位数，但永远不会大于的宽度unsigned int。一旦carry成为0，接下来的迭代就不会改变任何东西。