Linked *head = (struct Linked *)malloc(sizeof(struct Linked));;是什么
时间: 2024-01-24 09:20:48 浏览: 131
这是一行 C 语言代码,它使用了动态内存分配函数 `malloc()` 来分配内存,大小为 `sizeof(struct Linked)`,即结构体 `Linked` 的大小。它创建了一个名为 `head` 的指向结构体 `Linked` 的指针,并将分配的内存地址赋值给它。这通常用于创建链表的头结点。需要注意的是,在使用完 `head` 后,需要使用 `free()` 函数释放它所占用的内存空间,以避免内存泄漏问题。
相关问题
#include<stdio.h> #include<stdlib.h> typedef struct Node{ int data; struct Node* next; }Node; Node* initList(){ Node*list=(Node*)malloc(sizeof(Node)); list -> data=0; list->next=NULL; return list;} void headInsert(Node*list,int data){ Node*node=(Node*)malloc(sizeof(Node)); Node*head=list; node->data=data; node->next=list->next; list->next=node; list->data++; } void lastInsert(Node*list,int data){ Node*head=list; Node*node=(Node*)malloc(sizeof(Node)); node->data=data; node->next=NULL; list=list->next; while(list->next){ list=list->next; } list->data=node; list->data++; } void printList(Node*list){ list=list->next; while(list){ printf("%d",list->data); list=list->next; }printf("\n");} int main(){ Node*list=intiList(); headInsert(list,2); headInsert(list,3); headInsert(list,4); lastInsert(list,8); printList(list); return 0; }
I see that there is a typo in your code. In the `main()` function, you have a typo in the line `Node*list=intiList();`. It should be `Node*list=initList();` instead.
Here's the corrected version of your code:
```c
#include <stdio.h>
#include <stdlib.h>
typedef struct Node {
int data;
struct Node* next;
} Node;
Node* initList() {
Node* list = (Node*)malloc(sizeof(Node));
list->data = 0;
list->next = NULL;
return list;
}
void headInsert(Node* list, int data) {
Node* node = (Node*)malloc(sizeof(Node));
Node* head = list;
node->data = data;
node->next = list->next;
list->next = node;
list->data++;
}
void lastInsert(Node* list, int data) {
Node* head = list;
Node* node = (Node*)malloc(sizeof(Node));
node->data = data;
node->next = NULL;
list = list->next;
while (list->next) {
list = list->next;
}
list->next = node;
head->data++;
}
void printList(Node* list) {
list = list->next;
while (list) {
printf("%d ", list->data);
list = list->next;
}
printf("\n");
}
int main() {
Node* list = initList();
headInsert(list, 2);
headInsert(list, 3);
headInsert(list, 4);
lastInsert(list, 8);
printList(list);
return 0;
}
```
Now you should be able to compile and run your code without any syntax errors. The corrected code initializes a linked list, inserts nodes at the head and at the end, and then prints the data in the list.
帮我把这个程序注释一下#include <stdio.h> #include <stdlib.h> typedef struct Node { int data; struct Node *next; } Node, *LinkedList; LinkedList createLinkedList(int arr[], int n) { LinkedList head = (LinkedList) malloc(sizeof(Node)); head->next = NULL; Node *tail = head; int i; for (i = 0; i < n; i++) { Node *node = (Node *) malloc(sizeof(Node)); node->data = arr[i]; node->next = NULL; tail->next = node; tail = node; } return head; } void printLinkedList(LinkedList head) { Node *p = head->next; while (p != NULL) { printf("%d ", p->data); p = p->next; } printf("\n"); } void reverseLinkedList(LinkedList head) { Node *p = head->next; Node *q = NULL; Node *r = NULL; while (p != NULL) { r = q; q = p; p = p->next; q->next = r; } head->next = q; } int main() { int arr[] = {1, 9, 9, 6,2}; int n = sizeof(arr) / sizeof(arr[0]); LinkedList head = createLinkedList(arr, n); printf("原链表:"); printLinkedList(head); reverseLinkedList(head); printf("逆置后的链表:"); printLinkedList(head); return 0; }
当然可以,以下是程序的注释:
```
#include <stdio.h>
#include <stdlib.h>
// 定义一个结构体 Node,表示链表中的一个节点
typedef struct Node {
int data; // 节点中保存的数据
struct Node *next; // 指向下一个节点的指针
} Node, *LinkedList;
// 创建一个包含 n 个元素的链表,元素从数组 arr 中获取
LinkedList createLinkedList(int arr[], int n) {
// 创建一个头节点,并将其 next 指针设置为 NULL
LinkedList head = (LinkedList) malloc(sizeof(Node));
head->next = NULL;
// 创建一个指向当前链表尾部的指针 tail
Node *tail = head;
int i;
// 遍历数组 arr,将每个元素添加到链表中
for (i = 0; i < n; i++) {
// 创建一个新节点,并将其 data 值设置为当前数组元素的值
Node *node = (Node *) malloc(sizeof(Node));
node->data = arr[i];
node->next = NULL;
// 将新节点添加到链表尾部
tail->next = node;
tail = node;
}
// 返回链表头节点
return head;
}
// 打印链表中的所有元素
void printLinkedList(LinkedList head) {
// 创建一个指向链表头节点的指针 p
Node *p = head->next;
// 遍历链表中的所有节点,依次打印每个节点的 data 值
while (p != NULL) {
printf("%d ", p->data);
p = p->next;
}
printf("\n");
}
// 将链表逆置
void reverseLinkedList(LinkedList head) {
// 创建三个指针 p、q、r,分别指向链表中的当前节点、前一个节点和后一个节点
Node *p = head->next;
Node *q = NULL;
Node *r = NULL;
// 遍历链表中的所有节点,依次逆置每个节点
while (p != NULL) {
r = q;
q = p;
p = p->next;
q->next = r;
}
// 将链表头节点的 next 指针指向逆置后的链表头节点
head->next = q;
}
int main() {
// 定义一个数组 arr,包含一些整数
int arr[] = {1, 9, 9, 6, 2};
int n = sizeof(arr) / sizeof(arr[0]);
// 创建一个包含数组 arr 中元素的链表
LinkedList head = createLinkedList(arr, n);
// 打印原始链表
printf("原链表:");
printLinkedList(head);
// 将链表逆置
reverseLinkedList(head);
// 打印逆置后的链表
printf("逆置后的链表:");
printLinkedList(head);
return 0;
}
```
阅读全文