Question

I wonder why static objects call parent method and dynamic objects child method in this example.

#include <string>
#include <iostream>
using namespace std;

class Father {
public:
    virtual string Info() {
        return "I am father";
    }
};

class Son : public Father {
public:
    string Info() {
        return "I am son";
    }
};

int main() {
    Father f = Son();
    cout << f.Info(); // I am father
    Father* pf = new Son();
    cout << pf->Info(); // I am son
    return 0;
}

Answer 1

Because, Father f = Son() create object of type Father and copy attributes from object Son (at this case no attributes to copy), so Father * pf = new Son() receives pointer to object Son, it actually may be any Father-derived object.

Finally, in your example you have 3 objects. Father f, unnamed object Son() which copy to Father f, and Father * pf that points to object of type Son.