code to understand Pure Virtual Function

#include <iostream>
using namespace std;

class Cat{
    public:
        int mAge;
        int mWeight;
       
        virtual void innoculate()=0;
};

class Persian: public Cat
{
    public:
        virtual void innoculate()
        {
            cout << "successful innoculated" << endl;
        }
};

int main()
{
        //Cat c2; gives error: because Cat is a abstract class
    Persian c1;
    c1.innoculate();
    return 0;
}

OUTPUT: