Sword finger offer 15 Number of 1 in binary

Original link ： The finger of the sword Offer 15. Binary 1 The number of

 solution:

         002. Output binary 1 The number of _anieoo The blog of -CSDN Blog

class Solution {
public:
    int hammingWeight(uint32_t n) {
        int cnt = 0;    // Return value 
        while(n) {
            n -= (n & -n);
            cnt++;
        }
        return cnt;
    }
};