要求用链表加结构体完成如下简易的图书管理程序，运行时出现报错如下图，想请教一下应该怎么改。

Question

![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/703417304736160.png "#left"）

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<malloc.h>
typedef struct info
{
    int num;
    char name[20];
    char author[20];
    int price;
};

typedef struct node
{
    info book;
    struct node* next;
}node;

void initiatesl(node* h)
{
    h = (node*)malloc(sizeof(node));
    h->next = NULL;
}

void add(node* h, info* p)
{
    node* q, * t;
    q = (node*)malloc(sizeof(node));
    t = (node*)malloc(sizeof(node));
    q->book.num = p->num;
    strcpy(q->book.name, p->name);
    strcpy(q->book.author, p->author);
    q->book.price = p->price;
    if (h->next == NULL)
        h->next = q;
    else t->next = q;
    t = q;
    t->next = NULL;
}

void delete_(node* h, int i)
{
    node* p, * s;
    int j;
    p = h;
    j = 0;
    while (p->next != NULL && j < i - 1)
    {
        p = p->next;
        j++;
    }
    if (j != i - 1 || p->next == NULL)
    {
        printf("i is invalid \n");
        exit(0);
    }
    s = p->next;
    p->next = s->next;
    free(s);
}

void print(node* h);

void sort(node* h)
{
    node* x;
    node* h1;
    h1= (node*)malloc(sizeof(node));
    initiatesl(h1);
    while (h->next != NULL) {
        x = h->next;
        int i = 0, minnum = 1;
        int min = 0;
        min = x->book.price;
        node* p, * t;
        p = (node*)malloc(sizeof(node));
        t = (node*)malloc(sizeof(node));
        while (x != NULL) {
            if (x->book.price < min) {
                minnum = i + 1;
                min = x->book.price;
                p = x;
            }
            i++;
            x = x->next;
        }
        if (h1->next == NULL)
            h1->next = p;
        else t->next = p;
        t = p;
        delete_(h, minnum);
    }
    print(h1);
}

void print(node* h)
{
    printf("编号\t书名\t作者\t价钱\n");
    node* x;
    x = (node*)malloc(sizeof(node));
    x = h->next;
    while (x != NULL) {
        printf("%d\t%s\t%s\t%d\n", x->book.num, x->book.name, x->book.author, x->book.price);
        x = x->next;
    }
}

int main()
{
    node* h;
    h = (node*)malloc(sizeof(node));
    initiatesl(h);
    info data[4];
    data[0] = { 100001,"Basic","zhang",15 };
    data[1] = { 200022,"VB","Li",20 };
    data[2] = { 383283,"C","Wang",18 };
    data[3] = { 324444,"delphi","Zhao",23 };
    for (int i = 0; i < 4; i++) {
        add(h, &data[i]);
    }
    print(h);
    printf("删除第二个\n");
        delete_(h, 2);
    print(h);
    printf("排序完成后\n");
    sort(h);

    return 0;
}

Answer 1

初始化方法是错的。既然111行已经给头指针申请了空间，那么初始化函数里就直接用，不要再申请一次了。第21行删除掉
第100行也是没有意义的代码，删除掉