C++ program to override a function

#include<iostream>
#include<conio.h>

class base
{
    public:
        void fun()
        {
            std::cout<<"World is great";
            std::cout<<"nIt is a base class";
        }
};

class derived : public base
{
    public:
        void fun()
        {
            std::cout<<"nHigher Education"<<std::endl;
            std::cout<<"It is a derived class";
        }
};

int main()
{
    system("cls");

    derived d;
    d.fun();

    getch();
    return 0;
}

Higher Education
It is a derived class