PI Team π ❷

#include <iostream> using namespace std; template<typename T> class Base { private: int y = 10; public: Base() { cout << "B"; } virtual int GetY() { return y; } virtual int GetM() = 0; void setVal(int a) { y = a; } virtual ~Base() {} }; template<typename T> class Derived : public Base<T> { private: int y = 20; int m = 100; public: Derived() { cout << "D"; } int GetY() override { return y; } int GetM() override { return m; } void setVal(int a) { y = a + 5; } }; int main() { Base<int>* ptr = new Derived<int>(); cout << " "; ptr->setVal(30); cout << ptr->GetY() << " " << ptr->GetM() << endl; delete ptr; return 0; }

List<int>* ptr = new LinkedList<int>();
ptr->push(10);
ptr->push(20);
ptr->push(30);
cout << (*ptr)[1];

T pop() override {
    if (!end) throw runtime_error("Cannot pop from empty list");
    T value = end->data;
    LinkedListItem<T>* toDelete = end;
    if (start == end) {
        start = end = nullptr;
    } else {
        end = end->prev;
        end->next = nullptr;
    }
    delete toDelete;
    this->len--;
    return value;
}

class List {
public:
    virtual void print() {
        cout << "List" << endl;
    }
};

class ArrayList : public List {
public:
    void print() override {
        cout << "ArrayList" << endl;
    }
};

int main() {
    List* ptr = new ArrayList();
    ptr->print();        // شو رح يطبع؟
}

class List {
public:
    virtual void print() {
        cout << "List" << endl;
    }
};

class ArrayList : public List {
public:
    void print() override {
        cout << "ArrayList" << endl;
    }
};

int main() {
    List* ptr = new ArrayList();
    ptr->print();        // شو رح يطبع؟
}

الكود الاول جوابه الخيار الثاني

الكود الثاني جوابه اول خيار

#include <iostream> using namespace std; class List { public: virtual ~List() { cout << "List destructor" << endl; } }; class ArrayList : public List { public: ~ArrayList() { cout << "ArrayList destructor" << endl; } }; int main() { List* ptr = new ArrayList(); delete ptr; return 0; }