Answer to Question #192875 in C++ for DIVYAM SINGH

Question

a) Write a program to illustrate the use of virtual, non-virtual functions.

Answer 1

#include <iostream>

class Base
{
  public:

    virtual void VirtualFunc()
    {
        std::cout << "Base::VirtualFunc";
    }

    void NonVirtualFunc()
    {
        std::cout << "Base::NonVirtualFunc";
    }
};

class Derived : public Base
{
  public:

    virtual void VirtualFunc()
    {
        std::cout << "Derived::VirtualFunc";
    }

    void NonVirtualFunc()
    {
        std::cout << "Derived::NonVirtualFunc";
    }
};

int main()
{
    Base    b1;
    Derived d1;
    b1.VirtualFunc();           std::cout << "\n";
    b1.NonVirtualFunc();        std::cout << "\n";
    d1.VirtualFunc();           std::cout << "\n";
    d1.NonVirtualFunc();        std::cout << "\n\n";

    Base*    b2 = new Base;
    Derived* d2 = new Derived;
    b2->VirtualFunc();          std::cout << "\n";
    b2->NonVirtualFunc();       std::cout << "\n";
    d2->VirtualFunc();          std::cout << "\n";
    d2->NonVirtualFunc();       std::cout << "\n\n";

    Base* b3 = new Base;
    Base* d3 = new Derived;
    b3->VirtualFunc();          std::cout << "\n";
    b3->NonVirtualFunc();       std::cout << "\n";
    d3->VirtualFunc();          std::cout << "\n";
    d3->NonVirtualFunc();       std::cout << "\t<----- Attention!\n\n";

    delete b2;
    delete d2;
    delete b3;
    delete d3;
    
    return 0;    
}