Count the 1-Bits of a number using C++

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    int one_bits = 0;
    while (n > 0) {
        one_bits += (n & 1);
        n >>= 1;
    }
    cout << one_bits << '\n';
    return 0;
}