#include <iostream>
using namespace std;
class A{
    public:
    virtual void show() = 0;
    void fun(){
        cout<<"in A fun"<<endl;
    }
};
class B:public A{
    public:
    void display(){
        cout<<"In display"<<endl;
    }
    // void show() override{
    //     cout<<"in B show"<<endl;
    // }
};
int main() {
    B obj;
    obj.display();
    obj.show();
    obj.fun();
    return 0;
}