Constructors And Destructors In Multilevel Inheritance:)

If we create Constructors in All Levels in Multilevel Inheritance then the order of execution of Constructors is Same As the level
That is First The Base then Base 1 and Then Derived Class Constructor is Called

Destructors Follows the reverse order of inheritace

Program to Illustrate The Calling Of Constructors And Destructors During Multilevel Inheritance:

#include<iostream>
using namespace std;
class base
{
    int a;
    public:
        base(int b)
        {
            a=b;
            cout<<"\nBase Constructor Called";
            cout<<"\nA= "<<a;
        }
        ~base()
        {
            cout<<"\nBase Destructor Called";
        }
};
class base1:public base
{
    int b;
    public:
        base1(int a,int b):base(b) // the base1 is derived from base
        {
            b=a;
            cout<<"\nBase 1 Constructor Called";
            cout<<"\nB= "<<b;
        }
        ~base1()
        {
            cout<<"\nBase1 Destructor Called";
        }
};
class derived:public base1
{
    int x;
    public:
    derived(int y,int a,int b):base1(a,y)//one parameter for base class and other for base 1
    {
        x=y;
        cout<<"\nDerived Construtor Called";
        cout<<"\nX= "<<x;    }
~derived()
{
    cout<<"\nDerived Destructor Called";
}
};
main()
{
    derived d(10,20,21);
}

Output:

Else in all other inheritances The Base Class Constructor called First Then The Derived Class Constructor.