剑指48-不用加减乘除做加法

class Solution {
public:
    int Add(int num1, int num2)
    {
        return num2==0?num1:Add(num1^num2, (num1&num2)<<1);
    }
};

class Solution {
public:
    int Add(int num1, int num2)
    {
        return (int)(long) &((char *)(long)num1)[num2];
    }
};