帮我用c语言写一个图书管理系统，其中包括录入图书，显示图书，查询图书，修改图书，删除图书，录入读者信息，查询读者信息，修改读者信息，删除读者信息这些功能

好的，以下是一个简单的图书管理系统的代码示例：

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

#define MAX_BOOKS 100
#define MAX_READERS 100

struct Book {
    char title[50];
    char author[50];
    int year;
    float price;
};

struct Reader {
    char name[50];
    int age;
    char email[50];
};

struct Book books[MAX_BOOKS];
int num_books = 0;

struct Reader readers[MAX_READERS];
int num_readers = 0;

void add_book() {
    struct Book book;
    printf("Enter title: ");
    scanf("%s", book.title);
    printf("Enter author: ");
    scanf("%s", book.author);
    printf("Enter year: ");
    scanf("%d", &book.year);
    printf("Enter price: ");
    scanf("%f", &book.price);
    books[num_books++] = book;
    printf("Book added successfully.\n");
}

void display_books() {
    if (num_books == 0) {
        printf("No books found.\n");
        return;
    }
    printf("Title\tAuthor\tYear\tPrice\n");
    for (int i = 0; i < num_books; i++) {
        struct Book book = books[i];
        printf("%s\t%s\t%d\t%.2f\n", book.title, book.author, book.year, book.price);
    }
}

void search_book() {
    char title[50];
    printf("Enter title to search: ");
    scanf("%s", title);
    for (int i = 0; i < num_books; i++) {
        struct Book book = books[i];
        if (strcmp(book.title, title) == 0) {
            printf("Title\tAuthor\tYear\tPrice\n");
            printf("%s\t%s\t%d\t%.2f\n", book.title, book.author, book.year, book.price);
            return;
        }
    }
    printf("Book not found.\n");
}

void edit_book() {
    char title[50];
    printf("Enter title to edit: ");
    scanf("%s", title);
    for (int i = 0; i < num_books; i++) {
        struct Book *book = &books[i];
        if (strcmp(book->title, title) == 0) {
            printf("Enter new title: ");
            scanf("%s", book->title);
            printf("Enter new author: ");
            scanf("%s", book->author);
            printf("Enter new year: ");
            scanf("%d", &book->year);
            printf("Enter new price: ");
            scanf("%f", &book->price);
            printf("Book edited successfully.\n");
            return;
        }
    }
    printf("Book not found.\n");
}

void delete_book() {
    char title[50];
    printf("Enter title to delete: ");
    scanf("%s", title);
    for (int i = 0; i < num_books; i++) {
        struct Book *book = &books[i];
        if (strcmp(book->title, title) == 0) {
            for (int j = i; j < num_books - 1; j++) {
                books[j] = books[j + 1];
            }
            num_books--;
            printf("Book deleted successfully.\n");
            return;
        }
    }
    printf("Book not found.\n");
}

void add_reader() {
    struct Reader reader;
    printf("Enter name: ");
    scanf("%s", reader.name);
    printf("Enter age: ");
    scanf("%d", &reader.age);
    printf("Enter email: ");
    scanf("%s", reader.email);
    readers[num_readers++] = reader;
    printf("Reader added successfully.\n");
}

void display_readers() {
    if (num_readers == 0) {
        printf("No readers found.\n");
        return;
    }
    printf("Name\tAge\tEmail\n");
    for (int i = 0; i < num_readers; i++) {
        struct Reader reader = readers[i];
        printf("%s\t%d\t%s\n", reader.name, reader.age, reader.email);
    }
}

void search_reader() {
    char name[50];
    printf("Enter name to search: ");
    scanf("%s", name);
    for (int i = 0; i < num_readers; i++) {
        struct Reader reader = readers[i];
        if (strcmp(reader.name, name) == 0) {
            printf("Name\tAge\tEmail\n");
            printf("%s\t%d\t%s\n", reader.name, reader.age, reader.email);
            return;
        }
    }
    printf("Reader not found.\n");
}

void edit_reader() {
    char name[50];
    printf("Enter name to edit: ");
    scanf("%s", name);
    for (int i = 0; i < num_readers; i++) {
        struct Reader *reader = &readers[i];
        if (strcmp(reader->name, name) == 0) {
            printf("Enter new name: ");
            scanf("%s", reader->name);
            printf("Enter new age: ");
            scanf("%d", &reader->age);
            printf("Enter new email: ");
            scanf("%s", reader->email);
            printf("Reader edited successfully.\n");
            return;
        }
    }
    printf("Reader not found.\n");
}

void delete_reader() {
    char name[50];
    printf("Enter name to delete: ");
    scanf("%s", name);
    for (int i = 0; i < num_readers; i++) {
        struct Reader *reader = &readers[i];
        if (strcmp(reader->name, name) == 0) {
            for (int j = i; j < num_readers - 1; j++) {
                readers[j] = readers[j + 1];
            }
            num_readers--;
            printf("Reader deleted successfully.\n");
            return;
        }
    }
    printf("Reader not found.\n");
}

int main() {
    int choice;
    do {
        printf("\n");
        printf("1. Add book\n");
        printf("2. Display books\n");
        printf("3. Search book\n");
        printf("4. Edit book\n");
        printf("5. Delete book\n");
        printf("6. Add reader\n");
        printf("7. Display readers\n");
        printf("8. Search reader\n");
        printf("9. Edit reader\n");
        printf("10. Delete reader\n");
        printf("0. Exit\n");
        printf("\nEnter your choice: ");
        scanf("%d", &choice);
        printf("\n");
        switch (choice) {
            case 1:
                add_book();
                break;
            case 2:
                display_books();
                break;
            case 3:
                search_book();
                break;
            case 4:
                edit_book();
                break;
            case 5:
                delete_book();
                break;
            case 6:
                add_reader();
                break;
            case 7:
                display_readers();
                break;
            case 8:
                search_reader();
                break;
            case 9:
                edit_reader();
                break;
            case 10:
                delete_reader();
                break;
            case 0:
                printf("Exiting...\n");
                break;
            default:
                printf("Invalid choice.\n");
                break;
        }
    } while (choice != 0);
    return 0;
}

该程序使用结构体来存储书籍和读者信息，通过调用不同的函数来实现不同的功能。可以通过不断输入不同的选项来进行不同的操作。