单链表创建_2（typedef）

#include<stdio.h>
#include<stdlib.h>
 typedef struct node {
    char data;
    struct node* next;
}*Lnode,Node;

 Lnode AppendNode(Lnode head);//创建链表节点
void printNode(Lnode head);//遍历打印链表
void destroyList(Lnode head);//释放链表

int main()
{
    char c;
    Lnode head = NULL;
    head = (Lnode)malloc(sizeof(Node));
    head->next = NULL;
    printf("你想创建链表吗？(Y/N)");
    scanf_s("%c", &c);
    while (c == ‘y‘ || c==‘Y‘)
    {
        getchar();
        head = AppendNode(head);
        printf("你想创建链表节点吗？(Y/N)");
        scanf_s("%c", &c);
    }
    printNode(head);
    destroyList(head);
}

Lnode AppendNode(Lnode head)
{
    Lnode p = NULL;
    Lnode pr = head;
    p = (Lnode)malloc(sizeof(Node));
    if(p==NULL)//申请内存失败
    {
        printf("申请内存失败！");
        exit(0);
    }
    if (pr->next == NULL)//链表为空时，直接添加到头节点之后
    {
        pr->next = p;
        p->next = NULL;
    }
    else//链表不为空时，添加到链表最后
    {
        while (pr->next != NULL)
        {
            pr = pr->next;
        }
        pr->next = p;
        p->next = NULL;
    }
    printf("输入节点的数据：");
    scanf_s("%c",&(p->data));
    getchar();
    return head;
}

void printNode(Lnode head)
{
    printf("链表中的数据为：");
    Lnode p = head->next;
    if (p == NULL)
    {
        printf("这是一个空链表");
    }
    else
    {
        while (p != NULL)
        {
            printf("%c",p->data);
            p = p->next;
        }
    }
}

void destroyList(struct node* head)
{
    struct node* pr = head;
    struct node* p = NULL;
    if (pr!= NULL)
    {
        p = pr;
        pr = pr->next;
        free(p);
    }
}