删除C++中链表的第一个元素

#include <iostream>

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

void deleteFirstNode(Node** head) {
    if (*head == NULL) {
        std::cout << "链表为空，无法删除第一个元素！" << std::endl;
        return;
    }

    Node* temp = *head; // 保存头节点的地址

    *head = (*head)->next; // 头指针指向第二个节点

    delete temp; // 释放保存的头节点的内存
}

int main() {
    // 创建链表节点
    Node* head = new Node();
    Node* second = new Node();
    Node* third = new Node();

    // 设置节点数据
    head->data = 1;
    second->data = 2;
    third->data = 3;

    // 构建链表关系
    head->next = second;
    second->next = third;
    third->next = NULL;

    // 删除链表的第一个元素
    deleteFirstNode(&head);

    // 输出删除后的链表
    Node* current = head;
    while (current != NULL) {
        std::cout << current->data << " ";
        current = current->next;
    }
    std::cout << std::endl;

    return 0;
}