#include <iostream>

class Base {
public:
    int val;
    Base(int initialization);
    virtual void which();
};

Base::Base(int init) {
    val = init;
}

void Base::which() {
    std::cout << "Base" << "\n";
}

class Derived : public Base {
public:
    Derived(int init);
    void which();
};

Derived::Derived(int init) : Base(init) {

}

void Derived::which() {
    std::cout << "Derived" << "\n";
}

int main() {
    Base b = Derived(5);
    b.which(); //prints base, but I want Derived
    Base *pb = new Derived(5);
    pb->which(); //prints derived
}