这段代码是一个简单的链表操作程序,包括创建节点、在链表末尾添加节点、在指定位置插入节点和删除指定位置的节点。以下是详细的注释:

#include#include// 定义链表节点结构体struct listnode{int i; // 节点存储的整数值struct listnode *next; // 指向下一个节点的指针}Node;// 在链表末尾添加节点的函数声明struct listnode *list_append(struct listnode *node,int num);// 在指定位置插入节点的函数声明struct listnode *list_insert(struct listnode *node,int position,int num);// 删除指定位置节点的函数声明struct listnode *list_delete(struct listnode *node,int position);// 创建节点的函数声明struct listnode* createNode(int data);// 创建节点的函数实现struct listnode* createNode(int data) {struct listnode *newNode = (struct listnode *)malloc(sizeof(struct listnode));newNode->i = data;newNode->next = NULL;return newNode;}void main(){// 创建一个头节点并初始化为0struct listnode *head = createNode(0);// 创建一个临时头节点用于遍历struct listnode *head_t;// 分配内存给临时头节点head_t = (struct listnode*)malloc(sizeof(struct listnode));// 打印头节点的值printf("%d",head->i);// 将临时头节点指向头节点head_t = head;// 循环创建5个节点并添加到链表中for(int j = 0;ji = j+1;node->next = NULL;head->next = node;head = node;}// 打印最后一个节点的值printf("%d",head->i);// 遍历链表并打印每个节点的值struct listnode* curr = head_t;while(curr){printf("%d",curr->i);curr=curr->next;}// 在链表末尾添加一个值为7的节点,并遍历打印链表struct listnode* curr2 = list_append(head_t,7);while(curr2){printf("%d",curr2->i);curr2=curr2->next;}// 在链表的第2个位置插入一个值为2的节点,并遍历打印链表struct listnode* curr3 = list_insert(head_t,2,2);while(curr3){printf("%d",curr3->i);curr3=curr3->next;}// 删除链表的第6个位置的节点,并遍历打印链表struct listnode* curr4 = list_delete(head_t,6);while(curr4){printf("%d",curr4->i);curr4=curr4->next;}}// 在链表末尾添加节点的函数实现struct listnode *list_append(struct listnode *node,int num){struct listnode *node_head;struct listnode *node_head2;node_head = (struct listnode *)malloc(sizeof(struct listnode));node_head2 = (struct listnode *)malloc(sizeof(struct listnode));node_head = node;node_head2 = node;while(node_head->next){node_head = node_head->next;}struct listnode *node_end;node_end = (struct listnode *)malloc(sizeof(struct listnode));node_end->i = num;node_end->next = NULL;node_head->next = node_end;return node;}// 在指定位置插入节点的函数实现struct listnode *list_insert(struct listnode *node,int position,int num){struct listnode *node_head;node_head = (struct listnode *)malloc(sizeof(struct listnode));int pos_1 = 0;node_head = node;while(node_head->next){node_head = node_head->next;pos_1++;if(pos_1==position-1){break;}}struct listnode *newnode;newnode = (struct listnode *)malloc(sizeof(struct listnode));newnode->i=num;newnode->next=node_head->next;node_head->next = newnode;return node;}// 删除指定位置节点的函数实现struct listnode *list_delete(struct listnode *node,int position){struct listnode *node_head;node_head = (struct listnode *)malloc(sizeof(struct listnode));int pos_1 = 0;node_head = node;while(node_head->next){node_head = node_head->next;pos_1++;if(pos_1==position){break;}}if(node->next->next)node_head->next = node_head->next->next;else{node_head->next = NULL;}return node;}