implementation of builtin function for counting setbits

#include <iostream>
using namespace std;

int main()
{

int n1;
cin>>n1;

long long n2;
cin>>n2;

// for counting setbits for int range bits
cout << __builtin_popcount(n1) << endl;


// for counting setbits for long long range bits
cout << __builtin_popcountll(n2) << endl;

return 0;

}