C++ program - Polymorphism implementation using Virtual functions.

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mahmoud2506

2022-05-05

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Let’s see the example (without using virtual functions)

Let’s consider the following example:

#include <iostream>

using namespace std;

class Base{
	public:
		void disp(){
			cout<<"disp function of Base class"<<endl;
		}
};
class Derived1: public Base{
    public:
		void disp(){
			cout<<"disp function of Derived1 class"<<endl;
		}	
};
class Derived2: public Base{
    public:
		void disp(){
			cout<<"disp function of Derived2 class"<<endl;
		}	
};
int main(){
	
	Base *b;
	Derived1 D1;
	Derived2 D2;
	
	b= &D1;
	b->disp();
	
	b= &D2;
	b->disp();
	
	return 0;
}

Output

    disp function of Base class
    disp function of Base class

C++ program (Code Snippet) – Implementation of Polymorphism using Virtual Functions

How to access derived class’s functions (using virtual function)?

There are three things, you have to do implement a polymorphism using virtual member functions, and the steps are:

Use virtual keyword with Base class’s member function
Create a pointer of Base class, assign address of Derived class’s member function
Call member functions with the Base class’s pointer

Let’s consider the following example:

#include <iostream>

using namespace std;

class Base{
	public:
		virtual void disp(){
			cout<<"disp function of Base class"<<endl;
		}
};
class Derived1: public Base{
    public:
		void disp(){
			cout<<"disp function of Derived1 class"<<endl;
		}	
};
class Derived2: public Base{
    public:
		void disp(){
			cout<<"disp function of Derived2 class"<<endl;
		}	
};
int main(){
	
	Base *b;
	Derived1 D1;
	Derived2 D2;
	
	b= &D1;
	b->disp();
	
	b= &D2;
	b->disp();
	
	return 0;
}

Output

    disp function of Derived1 class
    disp function of Derived2 class

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total answers (1)

C++ program - Polymorphism implementation using Virtual functions.

C++ program - Polymorphism implementation using Virtual functions.

All Answers

Let’s see the example (without using virtual functions)

Output

C++ program (Code Snippet) – Implementation of Polymorphism using Virtual Functions

How to access derived class’s functions (using virtual function)?

Output

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