Constructor and destructor order, multilevel inheritance

In inheritance, constructors are called in the order of derivation: base class first, then derived classes (from the top of the hierarchy downwards). Destructors are called in the reverse order. In multilevel inheritance A -> B -> C, creating an object of C calls constructors A, B, C, and destructors C, B, A.

#include <iostream>
using namespace std;

class A {
public:
    A()  { cout << "Constructor of A" << endl; }
    ~A() { cout << "Destructor of A" << endl; }
};

class B : public A {
public:
    B()  { cout << "Constructor of B" << endl; }
    ~B() { cout << "Destructor of B" << endl; }
};

class C : public B {
public:
    C()  { cout << "Constructor of C" << endl; }
    ~C() { cout << "Destructor of C" << endl; }
};

int main() {
    cout << "Creating object of C" << endl;
    C obj;
    cout << "End of main" << endl;
    return 0;
}

Output:

Creating object of C
Constructor of A
Constructor of B
Constructor of C
End of main
Destructor of C
Destructor of B
Destructor of A

The derived constructor cannot finish before its base part exists, so the base is built first. Likewise the base part must be destroyed last, so destruction goes in reverse.