Please explain clearly how to find the output of the code below?

Question

A little revision,

class A{
public:
void f() {cout <<1;}
};

class B : public A{
private:
void f() {cout <<2;}
};

void c(A &a) {a. f();}

int main(){
B b;
C(b);
}

Answer 1

A little revision,

class A{
public:
void f() {cout <<1;}
};

class B : public A{
private:
void f() {cout <<2;}
};

void c(A &a) {a. f();}

int main(){
B b;
C(b);
}