ordinary queue, C++ (vc++)

ordinary queue

//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x86

#include <iostream>
using namespace std;

class Patient {
    public:
    int number,priority;
    static int counter;
    
    Patient() {
        counter++;
        number=counter;
    }
    
    Patient(int priority) {
        counter++;
        number=counter;
        this->priority=priority;
    }
    
    void Show() {
        cout << "(N=" << number << ",P=" << (this->priority) << ")" << endl;
    }
};

int Patient::counter=0;

class Node {
    public:
    Patient data;
    Node *next;
    
    Node() {
        next=0;
    }
};

class List {
    private:
    Node *head,*tail;
    
    public:
    List() {
        head=tail=0;
    }
    
    void Add2Tail() {
        if (head==0) {
            head=tail=new Node();
        }
        else {
            Node *temp=new Node();
            tail->next=temp;
            tail=temp;
        }
    }
    
    void DeleteHead() {
        if (head==0) {
            return;
        }
        else if (head==tail) {
            delete head;
            head=tail=0;
        }
        else {
            Node *temp=head->next;
            delete head;
            head=temp;
        }
    }
    
    Patient GetHeadValue() {
        return (head->data);
    }
    
    bool IsEmpty() {
        return (head==0);
    }
    
    void Print() {
        Node *temp=head;
        while (temp!=0) {
            temp->data.Show();
            temp=temp->next;
        }
    }
};

class Queue {
    private:
    List l;
    
    public:
    void Enqueue() {
        l.Add2Tail();
    }
    
    void Dequeue() {
        l.DeleteHead();
    }
    
    bool IsEmpty() {
        return l.IsEmpty();
    }
    
    Patient Peek() {
        return l.GetHeadValue();
    }
    
    void Print() {
        l.Print();
    }
};

int main()
{
    Queue q;
    int i=1;
    cout << "enqueuing: " << endl;
    while (i<=10) {
        q.Enqueue();
        cout << i << endl;
        i++;
    }
    cout << "dequeuing: " << endl;
    while (!q.IsEmpty()) {
        cout << q.Peek().number << endl;
        q.Dequeue();
    }
}


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