Singly Linked List

example:

#include <iostream>

using namespace std;

class Node {
    private:
        Node(string s, Node* n);
        string body;
        Node* next;
    friend class SinglyLinkedList;
};

Node::Node(string s, Node* n){
    body = s;
    next = n;
};

class SinglyLinkedList{
    public:
        SinglyLinkedList();
        ~SinglyLinkedList();
        void AddInFront(string s);
        void RemoveInFront();
        void ShowAll();
    private:
        Node* head;
};

SinglyLinkedList::SinglyLinkedList(){
    head = NULL;
};

SinglyLinkedList::~SinglyLinkedList(){
    while (head != NULL){
        RemoveInFront();
    }
};

void SinglyLinkedList::AddInFront(string s){
    Node* n = new Node(s, head);
    head = n;
};

void SinglyLinkedList::RemoveInFront(){
    if(head != NULL){
        Node* tmp = head;
        head = head->next;
        delete tmp;
    }
};

void SinglyLinkedList::ShowAll(){
    Node* n = head;
    while(n != NULL){
        cout << n -> body << endl;
        n = n -> next;
    }
}

int main()
{
    cout << "- Singly Linked List exercise -" << endl;

    cout << "Create a new SinglyLinkedList: " << endl;
    SinglyLinkedList mySinglyLinkedList;
    mySinglyLinkedList.ShowAll();
    cout << endl;

    cout << "Remove nothing in a empty Singly Linked List: " << endl;
    mySinglyLinkedList.RemoveInFront();
    mySinglyLinkedList.ShowAll();
    cout << endl;

    cout << "Insert something: " << endl;
    mySinglyLinkedList.AddInFront("ABC");
    mySinglyLinkedList.AddInFront("DEFGH");
    mySinglyLinkedList.AddInFront("I");
    mySinglyLinkedList.AddInFront("JK");
    mySinglyLinkedList.AddInFront("LMN");
    mySinglyLinkedList.ShowAll();
    cout << endl;

    cout << "Remove something: " << endl;
    mySinglyLinkedList.RemoveInFront();
    mySinglyLinkedList.RemoveInFront();
    mySinglyLinkedList.ShowAll();
    cout << endl;

    return 0;
}