有关下面代码的说法正确的是（ ）。
#include <iostream> class Node {public: int Value; Node * Next; Node(int Val, Node * Nxt = nullptr) { Value = Val; Next = Nxt; }}; int main() { Node * firstNode = new Node(10); firstNode->Next = new Node(100); firstNode->Next->Next = new Node(111, firstNode); return 0;}