[C++]Review Questions for specialization in a derived class

1. Guess the outcome generated by the following code and run it to verify your outcome!!

#include <iostream>

using namespace std;

class A {

public:
    void  foo() {
        cout << "foo() is called in class A" << endl;
    }

    void  foo(int i) {
        cout << "foo(int i) is called in class A" << endl;
        cout << "i's value: " << i << endl;
    }

};

class aa : public A {
};

int main()
{
   aa myaa;

   myaa.foo();
   myaa.foo(100);
}

2. What's wrong with the following code

#include <iostream>

using namespace std;

class A {

public:
    void  foo() {
        cout << "foo() is called in class A" << endl;
    }

    void  foo(int i) {
        cout << "foo(int i) is called in class A" << endl;
        cout << "i's value: " << i << endl;
    }

};

class aa : public A {
public:
    void foo() {
        cout << "foo() is called in class aa" << endl;
    }
};

int main()
{
   aa myaa;

   myaa.foo();
   myaa.foo(100);
}