virtual function

// CPP program to illustrate
// concept of Virtual Functions

#include <iostream>
using namespace std;

class base {
public:
virtual void print()
{
cout << "print base class" << endl;
}

void show()
{
cout << "show base class" << endl;
}
};

class derived : public base {
public:
void print()
{
cout << "print derived class" << endl;
}

void show()
{
cout << "show derived class" << endl;
}
};

int main()
{
base* bptr;
derived d;
bptr = &d;

// virtual function, binded at runtime
bptr->print();

// Non-virtual function, binded at compile time
bptr->show();
}