给我一个创建并显示链表的可成功运行的c++程序

以下是一个创建并显示链表的C++程序：

#include <iostream>
using namespace std;

struct Node {
    int data;
    Node* next;
};

void insert(Node*& head, int data) {
    Node* newNode = new Node;
    newNode->data = data;
    newNode->next = NULL;

    if (head == NULL) {
        head = newNode;
    }
    else {
        Node* temp = head;
        while (temp->next != NULL) {
            temp = temp->next;
        }
        temp->next = newNode;
    }
}

void display(Node* head) {
    Node* temp = head;
    while (temp != NULL) {
        cout << temp->data << " ";
        temp = temp->next;
    }
}

int main() {
    Node* head = NULL;

    insert(head, 1);
    insert(head, 2);
    insert(head, 3);

    display(head);

    return 0;
}

运行结果为：1 2 3