Predict the output

classDilemma.cpp

#include <iostream>
using namespace std;

class A{
    public:
    virtual void functionA() {
        cout << "function A of class A called!" << endl;
    }
    virtual void functionB() {
        cout << "function B of class A called!" << endl;
    }
    void functionC() {
        functionA();
        functionB();
    }
};

class B: public A{
    public:
    void functionA() {
        cout << "function A of class B called!" << endl;
    }
    void functionB() {
        cout << "function B of class B called" << endl;
    }
};

int main() {
    A helloA;
    B helloB;

    helloB.functionC();
}

unary_operators.cpp

#include <iostream>
using namespace std;
int a = 4;
int func(int a, int b = 13) {
	int c = a++ + ++::a*3 -++b;
	return c;
}
int main() {
	int a1 = 5;
	cout << func(a1);
	return 0;
}