图书借阅管理系统C语言

好的，下面是一个简单的图书借阅管理系统的C语言实现示例，包括借阅、归还、查询等基本功能：

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

#define MAX_BOOKS 100
#define MAX_NAME 50
#define MAX_ID 10

typedef struct {
    char book_id[MAX_ID];
    char book_name[MAX_NAME];
    int count;
    int borrowed; // 已借出数量
} Book;

typedef struct {
    char reader_id[MAX_ID];
    char reader_name[MAX_NAME];
    Book books[MAX_BOOKS];
    int book_count;
} Reader;

Reader readers[MAX_BOOKS];
int reader_count = 0;

void add_reader() {
    Reader reader;
    printf("请输入读者ID：");
    scanf("%s", reader.reader_id);
    printf("请输入读者姓名：");
    scanf("%s", reader.reader_name);
    reader.book_count = 0;
    readers[reader_count++] = reader;
    printf("读者添加成功！\n");
}

void add_book() {
    Book book;
    printf("请输入图书ID：");
    scanf("%s", book.book_id);
    printf("请输入图书名称：");
    scanf("%s", book.book_name);
    printf("请输入图书总数：");
    scanf("%d", &book.count);
    book.borrowed = 0;
    int i;
    for (i = 0; i < reader_count; i++) {
        readers[i].books[readers[i].book_count++] = book;
    }
    printf("图书添加成功！\n");
}

void borrow_book() {
    char reader_id[MAX_ID];
    char book_id[MAX_ID];
    printf("请输入读者ID：");
    scanf("%s", reader_id);
    printf("请输入图书ID：");
    scanf("%s", book_id);
    int i, j;
    for (i = 0; i < reader_count; i++) {
        if (strcmp(readers[i].reader_id, reader_id) == 0) {
            for (j = 0; j < readers[i].book_count; j++) {
                if (strcmp(readers[i].books[j].book_id, book_id) == 0) {
                    if (readers[i].books[j].borrowed >= readers[i].books[j].count) {
                        printf("该图书已全部借出！\n");
                        return;
                    } else {
                        readers[i].books[j].borrowed++;
                        printf("借阅成功！\n");
                        return;
                    }
                }
            }
            printf("未找到该图书！\n");
            return;
        }
    }
    printf("未找到该读者！\n");
}

void return_book() {
    char reader_id[MAX_ID];
    char book_id[MAX_ID];
    printf("请输入读者ID：");
    scanf("%s", reader_id);
    printf("请输入图书ID：");
    scanf("%s", book_id);
    int i, j;
    for (i = 0; i < reader_count; i++) {
        if (strcmp(readers[i].reader_id, reader_id) == 0) {
            for (j = 0; j < readers[i].book_count; j++) {
                if (strcmp(readers[i].books[j].book_id, book_id) == 0) {
                    if (readers[i].books[j].borrowed <= 0) {
                        printf("该图书未被借出！\n");
                        return;
                    } else {
                        readers[i].books[j].borrowed--;
                        printf("归还成功！\n");
                        return;
                    }
                }
            }
            printf("未找到该图书！\n");
            return;
        }
    }
    printf("未找到该读者！\n");
}

void list_books() {
    char reader_id[MAX_ID];
    printf("请输入读者ID：");
    scanf("%s", reader_id);
    int i, j;
    for (i = 0; i < reader_count; i++) {
        if (strcmp(readers[i].reader_id, reader_id) == 0) {
            printf("图书ID\t\t图书名称\t\t总数\t\t已借出数量\n");
            for (j = 0; j < readers[i].book_count; j++) {
                printf("%s\t\t%s\t\t%d\t\t%d\n", readers[i].books[j].book_id, readers[i].books[j].book_name, readers[i].books[j].count, readers[i].books[j].borrowed);
            }
            return;
        }
    }
    printf("未找到该读者！\n");
}

void menu() {
    printf("1. 添加读者\n");
    printf("2. 添加图书\n");
    printf("3. 借阅图书\n");
    printf("4. 归还图书\n");
    printf("5. 查看图书\n");
    printf("6. 退出\n");
    printf("请选择操作：");
}

int main() {
    while (1) {
        menu();
        int choice;
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_reader();
                break;
            case 2:
                add_book();
                break;
            case 3:
                borrow_book();
                break;
            case 4:
                return_book();
                break;
            case 5:
                list_books();
                break;
            case 6:
                return 0;
            default:
                printf("无效操作，请重新选择！\n");
        }
    }
    return 0;
}

以上是一个简单的图书借阅管理系统的C语言实现示例，包含了添加读者、添加图书、借阅图书、归还图书、查看图书等基本功能。希望对您有所帮助！