用c语言定义一个包含图书信息（书号、书名、价格）的顺序表，读入相应的图书数据完成图书信息表的创建，然后将图书按照价格降序排序，逐行输出排序后每本图书的信息。

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

#define MAX_TITLE_LEN 50
#define MAX_NUM_BOOKS 100

typedef struct {
    int book_id;
    char title[MAX_TITLE_LEN];
    float price;
} Book;

void swap(Book *a, Book *b) {
    Book tmp = *a;
    *a = *b;
    *b = tmp;
}

void sort_books(Book *books, int n) {
    int i, j;
    for (i = 0; i < n - 1; i++) {
        for (j = 0; j < n - i - 1; j++) {
            if (books[j].price < books[j + 1].price) {
                swap(&books[j], &books[j + 1]);
            }
        }
    }
}

int main() {
    Book books[MAX_NUM_BOOKS];
    int n, i;

    printf("Enter number of books: ");
    scanf("%d", &n);

    for (i = 0; i < n; i++) {
        printf("\nEnter book %d info:\n", i + 1);
        printf("Book ID: ");
        scanf("%d", &books[i].book_id);
        printf("Title: ");
        scanf("%s", books[i].title);
        printf("Price: ");
        scanf("%f", &books[i].price);
    }

    sort_books(books, n);

    printf("\nBook info sorted by price in descending order:\n");
    for (i = 0; i < n; i++) {
        printf("%d\t%s\t%.2f\n", books[i].book_id, books[i].title, books[i].price);
    }

    return 0;
}