polymorphism example in c++

Example: polymorphism-program.cpp

#include <iostream>

using namespace std;

class Person{
public:
    virtual void introduce(){
    cout <<"hey from person"<<endl;
    }
};

class Student : public Person{
public:
    void introduce(){
    cout <<"hey from student"<<endl;
    }
};

class Farmer : public Person{
public:
    void introduce(){
    cout <<"hey from Farmer"<<endl;
    }
};

void whosThis(Person &p){
p.introduce();
}

int main()
{
    Farmer anil;
    Student alex;

    whosThis(anil);
    whosThis(alex);
    return 0;
}

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Cpp Example