Virtual function and runtime polymorphism

Author: anishsingh20

VirtualFunctions.cpp

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+#include<iostream>
+//RUNTIME POLYMORPHISM - Virtual functions are used to achieve runtime polymorphism. It is achieved by function overriding(re-defination)
+// of base class method which is re-defined in a derived class.
+
+//Then a pointer of type base class is created which refers to derived class object
+//and the base method is called , which actually executes the derived class version
+//method.
+//Dynamic binding is done i.e during runtime 
+
+using namespace std;
+
+class Person {
+	public:
+		//does runtime binding of intro() based on the type of object is used to invoke the method
+		virtual void intro() {
+			cout<<"Hello I am a Person"<<endl;
+		}
+};
+
+class Anish : public Person {
+	public:
+		void intro() { //function overridden
+			cout<<"This is Anish"<<endl;
+		}
+};
+
+class Mrinal : public Person {
+	public:
+		void intro() {
+			cout<<"Hi this is Mrinal"<<endl;
+		}
+};
+
+
+void getIntro(Person &p) {
+	p.intro();
+}
+
+
+int main() {
+	
+	Person p;
+	Anish a;
+	Mrinal m;
+	getIntro(a);//without virtual base function , it would have printed the base method value
+	getIntro(m);
+	
+	return 0;
+}