Illustrates use of Virtual base class
Write a C++ Program to illustrates the use of Virtual base class. Here’s a Simple C++ Program to illustrates the use of Virtual base class in C++ Programming Language.
What is Polymorphism in C++ ?
The word polymorphism means having many forms. Typically, polymorphism occurs when there is a hierarchy of classes and they are related by inheritance.
C++ polymorphism means that a call to a member function will cause a different function to be executed depending on the type of object that invokes the function.
Virtual Function : :
A virtual function is a function in a base class that is declared using the keyword virtual. Defining in a base class a virtual function, with another version in a derived class, signals to the compiler that we don’t want static linkage for this function.
Below is the source code for C++ Program to illustrates the use of Virtual base class which is successfully compiled and run on Windows System to produce desired output as shown below :
SOURCE CODE : :
/* C++ Program to illustrates the use of Virtual base class */ #include<iostream> using namespace std; // This program illustrates the use of the virtual base clas class B // Base class { protected: int base_data ; public: void get_b_data(int b) { cout << "\n\n Accessing the data from the base class B------------>" ; base_data = b ; } void display_b_data(void) { cout << "\n base_data = " << base_data ; } }; class D1 : virtual public B // First virtual base class. { // This class is derived from the class B. protected: int der1_data ; public: void get_d1_data(int d1) { cout << "\n\n Accessing the data from the derived class D1---------->" ; der1_data = d1 ; } void display_d1_data(void) { cout << "\n der1_data = " << der1_data ; } }; class D2 : virtual public B // Second virtual base class. { // This class is also derived from the class B. protected: int der2_data ; public: void get_d2_data(int d2) { cout << "\n\n Accessing the data from the derived class D2---------->" ; der2_data = d2 ; } void display_d2_data(void) { cout << "\n der2_data = " << der2_data ; } }; class D3 : public D1, public D2 // This class inherits the properties of the { // classes B, D1 and D2. public: int der3_data ; public: void get_d3_data(int d3) { cout << "\n\n Accessing the data from the derived class D3---------->" ; der3_data = d3 ; } void display_d3_data(void) { cout << "\n der3_data = " << der3_data ; } }; int main() { D3 der3 ; // Object of the class D3. der3.get_b_data(7); // Accessing the member functions of the base class B. der3.display_b_data( ) ; der3.get_d1_data(8) ; // Accessing the member functions of the class D1. der3.display_d1_data( ); der3.get_d2_data(18) ; // Accessing the member functions of the class D2. der3.display_d2_data( ); der3.get_d3_data(15); // Accessing the member functions from its own class D3. der3.display_d3_data( ); return 0; }
OUTPUT : :
/* C++ Program to illustrates the use of Virtual base class */ Accessing the data from the base class B------------> base_data = 7 Accessing the data from the derived class D1----------> der1_data = 8 Accessing the data from the derived class D2----------> der2_data = 18 Accessing the data from the derived class D3----------> der3_data = 15 Process returned 0
Above is the source code and output for C++ Program to illustrates the use of Virtual base class which is successfully compiled and run on Windows System to produce desired output.
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