解决指指针指向头节点进行free操作之后头节点丢失问题

解决办法一:

在删除函数执行free(node)后，加上一句语句node = NULL

解决方法二：

传入参数的时候使用双重指针，如下图

调试代码如下，断点设置如下

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

// 链表节点定义
struct Node {
    int data;
    struct Node* next;
};

void insertNode(struct Node** head, int data) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    newNode->data = data;
    newNode->next = NULL;

    if (*head == NULL) {//空指针
        *head = newNode;
    } else {
        struct Node* current = *head;
        while (current->next != NULL) {
            current = current->next;
        }
        current->next = newNode;
    }
}

void deleteNodeWithData(Node **head, Node* nodeToDelete) {
    if (nodeToDelete == NULL || *head == NULL) {
        return;
    }

    if (*head == nodeToDelete) {
        *head = nodeToDelete->next;
    } else {
        Node* current = *head;
        while (current != NULL && current->next != nodeToDelete) {
            current = current->next;
        }
        if (current != NULL) {
            current->next = nodeToDelete->next;
        }
    }

    free(nodeToDelete);
    
}

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

    int data;
    while (1) {
        scanf("%d", &data);
        if (data == -1) {
            break;
        }
        insertNode(&head, data);//如果定义的是指针head，双指针定义的函数需要传进去地址
    }

    Node *p;
    p = head->next->next;
    deleteNodeWithData(&head,p);
    while(1){
        printf("hellow");
    }
  

    

}