leetcode 191 Number of 1 Bits C++

class Solution {
public:
int hammingWeight(uint32_t n) {
int count = 0;
while(n){
if (n % 2 == 1) count++;
n = n>>1;
}
return count;
}
};

class Solution {
public:
int hammingWeight(uint32_t n)
{
int res = 0;
while(n)
{
n &= n - 1;
++ res;
}
return res;
}
};