Multi-level inheritance in C++ language

Multi-level inheritance in C++ language

In this tutorial, we will discuss an Oop concept of the multi-level inheritance in C++ language.

Program 1

#include <iostream>
#include <conio.h>
using namespace std;
class Base{
public:
    void display1(){
    cout<<"I am base class"<<endl;
    }

};
class Intermediate: public Base{
public:
    void display2(){
    cout<<"I am an intermediate class"<<endl;
    }

};

class derived: public Intermediate{
public:
    void display3(){
    cout<<"I am derived class"<<endl;
    }

};
int main()
{
    derived obj;
    obj.display1();
    obj.display2();
    obj.display3();
    getch();
    return 0;
}

The above code is executed, it produces the following result

I am base class
I am an intermediate class
I am derived class

Program 2

Explanation of above program

#include <iostream>
using namespace std;
class A  //class A
{           // start of class A
public:  //public section in class A
int x,y;  //assign two variables x,y
void values()
{
x=12;  //assign value for x
y=18;  //assign value for y
}
};   // end of class A
class B:public A  //inherit properties B from A
{   // start of class B
public:  //public section in class B
void add(){  //function add
cout << “The result of x+y is ” << x+y<<endl;
// display statement output of x+y
}
};  // end of class B
class C:public B //inherit properties C from B
{
public:  //public section in class C
void sub() //function sub
{
cout << “The result of x-y is ” << x-y<<endl;
// display statement output of x-y
}
};
class D:public C//inherit properties D from C
{// start of class C
public:  //public section in class D
void mul() //function mul
{
cout << “The result of x*y is ” << x*y<<endl;
 // display statement output of x*y
}
};  // end of class C
int main() // main section
{
D obj;  //object for class D(child classs)
obj.values();  //called function value through object
obj.add(); //called function add through object
obj.sub(); //called function sub through object
obj.mul();//called function mul through object
return 0;
}