Count the No. of Set Bits of N using C++

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    int res = 0;
    for (int bit = 31; bit >= 0; bit--) {
        // don't forget to type cast into boolean
        res += ((bool) (n & (1 << bit)));
    }
    cout << res << '\n';
    return 0;
}