linux 单向链表

#include <stdio.h>
#include <stdlib.h>

// 定义链表节点结构
struct Node {
    int data;
    struct Node* next;
};

// 创建新节点
struct Node* createNode(int data) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    newNode->data = data;
    newNode->next = NULL;
    return newNode;
}

// 在链表头部插入节点
void insertAtHead(struct Node** head, int data) {
    struct Node* newNode = createNode(data);
    newNode->next = *head;
    *head = newNode;
}

// 删除链表中的节点（假设节点存在）
void deleteNode(struct Node** head, int key) {
    struct Node* temp = *head;
    struct Node* prev = NULL;

    if (temp != NULL && temp->data == key) {
        *head = temp->next;
        free(temp);
        return;
    }

    while (temp != NULL && temp->data != key) {
        prev = temp;
        temp = temp->next;
    }

    if (temp == NULL) return;

    prev->next = temp->next;
    free(temp);
}

// 遍历并打印链表
void printList(struct Node* node) {
    while (node != NULL) {
        printf("%d -> ", node->data);
        node = node->next;
    }
    printf("NULL\n");
}

int main() {
    struct Node* head = NULL;

    insertAtHead(&head, 3);
    insertAtHead(&head, 2);
    insertAtHead(&head, 1);

    printf("Linked List:\n");
    printList(head);

    deleteNode(&head, 2);

    printf("After deleting 2:\n");
    printList(head);

    return 0;
}