#include<iostream>
using namespace std;

class base
{
    double x;

public:
    void setx(double i)
    {
        x=i;
    }

    void showx()
    {
        cout<<"X = "<<x<<endl;
    }
};

class derived :public base
{
    double y;

public:
    void sety(double i)
    {
        y=i;
    }
    void showy()
    {
        cout<<"Y = "<<y<<endl;
    }
};


int main()
{
    derived obj;

    obj.setx(10);
    obj.sety(20);

    obj.showx();
    obj.showy();
    
    return 0;
}