C++ Program using pure virtual function

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In this program, You will learn how to implement a pure virtual function in C++.

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virtual void msg() = 0;

Example: How to implement a pure virtual function in C++.

#include<iostream>
using namespace std;

class First {
public:

   virtual void msg() = 0;
};

class Second : public First {
public:

   void msg() {
       cout << "Hello";
   }
};

int main() {

   First *f;
   Second s;
   f = &s;
   f->msg();

   return 0;
}

Output:

Hello