#include <iostream>
using namespace std;
class Element {
private:
int atomic_number;
public:
Element(int an_atomic_number) :
atomic_number(an_atomic_number) {}
int get_atomic_number() const {
return atomic_number;
}
};
int main() {
Element na(11);
Element mg = 12; // alternative form
cout << mg.get_atomic_number() << endl; // prints 12
return 0;
}