Leetcode 371. 两整数之和

class Solution {
public:
    int add(int a, int b)
    {
        int jinwei = 0;
        int wujinwei = 0;
        while(b!=0)
        {
            jinwei = ((a&b)<<1);
            wujinwei = a ^ b;
            a = wujinwei;
            b = jinwei;
        }
        return wujinwei;
    }
    
    int getSum(int a, int b)
    {
        return add(a, b);
    }
};