cpp

#include <iostream>
using namespace std;

class Base {
    int a, b;
public:
    Base(int x, int y) {
        a = x;
        b = y;
    }
    void show() {
        cout << "Base" << endl;
        cout << a << '\t' << b << endl;
    }
};

class Derived: public Base {
    int c, d;
public:
    Derived(int x, int y, int z, int m) :Base(x, y) {
        c = z;
        d = m;
    }
    void show() {
        cout << "Derived" << endl;
        cout << c << 't' << d << endl;
    }
};

int main() {
    Base B1(50, 50), *pb;
    Derived D1(10, 20, 30, 40);
    pb = &D1;
    pb->show();
    return 0;
}