关于new分配空间

#include <iostream>
using namespace std;
struct Node {
    int val;
    Node *next;
    Node(int v=0,Node * n=NULL){
        val=v;
        next=n;
    }
};
Node * head;

void fun(){
    head=new Node(1);
    cout<<"head"<<head->val<<" "<<head->next<<endl;
}

int main(){
    fun();
    cout<<"head"<<head->val<<" "<<head->next<<endl;
    delete head;
    return 0;
}#includ