CPP program to implement virtual base class

In this article we will learn to implement a CPP program to implement virtual base class. A C++ program is provided below to illustrate virtual base class.

Program is as follows:

#include <iostream>
using namespace std;
class A
{
	protected:
		int x;
};
class B : virtual public A
{
	private:
		int y;
	public:
		B(int p)
		{
			x = p;
		}
};
class C : virtual public A
{
	private:
		int z;
	public:
		C(int p)
		{
			x = 20;
		}
};
//Which x is accessible inside class D is dependent upon the sequence of sub classes specified in below line
class D: B,C
{
	public:
		D(int p) : B(p), C(p)
		{}
		void display()
		{
			cout<<"x = "<<x;
		}
};
int main()
{
	D d(10);
	d.display();
	return 0;
}

Output for the above program is as follows:

x = 20

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.