用c语言写图书借阅管理系统 主要分为两⼤功能： 1)图书管理(增加图书、查询图书、删除图书、图书借阅、还书)； 2)会员管理(增加会员、查询会员、删除会员、借书信息)；的程序代码

好的，以下是一个简单的C语言图书借阅管理系统的程序代码示例，您可以根据自己的需求进行修改和完善：

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

//定义图书结构体
typedef struct Book {
    char id[10]; //图书编号
    char name[50]; //图书名称
    char author[50]; //图书作者
    int amount; //图书数量
    int borrowed; //借出数量
} Book;

//定义会员结构体
typedef struct Member {
    char id[10]; //会员编号
    char name[50]; //会员名称
    int borrowedNum; //已借数量
} Member;

//定义全局变量
Book books[100]; //图书数组
Member members[100]; //会员数组
int bookNum = 0; //图书数量
int memberNum = 0; //会员数量

//函数声明
void addBook();
void queryBook();
void deleteBook();
void borrowBook();
void returnBook();
void addMember();
void queryMember();
void deleteMember();
void queryBorrowed();

int main() {
    int choice;
    do {
        //显示菜单
        printf("\n\nWelcome to the library management system!\n");
        printf("1. Add book\n");
        printf("2. Query book\n");
        printf("3. Delete book\n");
        printf("4. Borrow book\n");
        printf("5. Return book\n");
        printf("6. Add member\n");
        printf("7. Query member\n");
        printf("8. Delete member\n");
        printf("9. Query borrowed books\n");
        printf("0. Exit\n");
        printf("Please enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                addBook();
                break;
            case 2:
                queryBook();
                break;
            case 3:
                deleteBook();
                break;
            case 4:
                borrowBook();
                break;
            case 5:
                returnBook();
                break;
            case 6:
                addMember();
                break;
            case 7:
                queryMember();
                break;
            case 8:
                deleteMember();
                break;
            case 9:
                queryBorrowed();
                break;
            case 0:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice!\n");
                break;
        }
    } while (choice != 0);
    return 0;
}

//添加图书
void addBook() {
    if (bookNum >= 100) {
        printf("The library is full!\n");
        return;
    }
    printf("Please enter the book id: ");
    scanf("%s", books[bookNum].id);
    printf("Please enter the book name: ");
    scanf("%s", books[bookNum].name);
    printf("Please enter the author: ");
    scanf("%s", books[bookNum].author);
    printf("Please enter the amount: ");
    scanf("%d", &books[bookNum].amount);
    books[bookNum].borrowed = 0;
    bookNum++;
    printf("Add book successfully!\n");
}

//查询图书
void queryBook() {
    char id[10];
    printf("Please enter the book id: ");
    scanf("%s", id);
    for (int i = 0; i < bookNum; i++) {
        if (strcmp(books[i].id, id) == 0) {
            printf("id: %s name: %s author: %s amount: %d borrowed: %d\n", books[i].id, books[i].name, books[i].author, books[i].amount, books[i].borrowed);
            return;
        }
    }
    printf("Book not found!\n");
}

//删除图书
void deleteBook() {
    char id[10];
    printf("Please enter the book id: ");
    scanf("%s", id);
    for (int i = 0; i < bookNum; i++) {
        if (strcmp(books[i].id, id) == 0) {
            for (int j = i; j < bookNum - 1; j++) {
                books[j] = books[j + 1];
            }
            bookNum--;
            printf("Delete book successfully!\n");
            return;
        }
    }
    printf("Book not found!\n");
}

//借书
void borrowBook() {
    char bookId[10];
    char memberId[10];
    printf("Please enter the book id: ");
    scanf("%s", bookId);
    printf("Please enter the member id: ");
    scanf("%s", memberId);
    //查找图书
    int bookIndex = -1;
    for (int i = 0; i < bookNum; i++) {
        if (strcmp(books[i].id, bookId) == 0) {
            bookIndex = i;
            break;
        }
    }
    if (bookIndex == -1) {
        printf("Book not found!\n");
        return;
    }
    //查找会员
    int memberIndex = -1;
    for (int i = 0; i < memberNum; i++) {
        if (strcmp(members[i].id, memberId) == 0) {
            memberIndex = i;
            break;
        }
    }
    if (memberIndex == -1) {
        printf("Member not found!\n");
        return;
    }
    //判断图书数量是否足够
    if (books[bookIndex].amount - books[bookIndex].borrowed <= 0) {
        printf("The book has been borrowed out!\n");
        return;
    }
    //借书
    books[bookIndex].borrowed++;
    members[memberIndex].borrowedNum++;
    printf("Borrow book successfully!\n");
}

//还书
void returnBook() {
    char bookId[10];
    char memberId[10];
    printf("Please enter the book id: ");
    scanf("%s", bookId);
    printf("Please enter the member id: ");
    scanf("%s", memberId);
    //查找图书
    int bookIndex = -1;
    for (int i = 0; i < bookNum; i++) {
        if (strcmp(books[i].id, bookId) == 0) {
            bookIndex = i;
            break;
        }
    }
    if (bookIndex == -1) {
        printf("Book not found!\n");
        return;
    }
    //查找会员
    int memberIndex = -1;
    for (int i = 0; i < memberNum; i++) {
        if (strcmp(members[i].id, memberId) == 0) {
            memberIndex = i;
            break;
        }
    }
    if (memberIndex == -1) {
        printf("Member not found!\n");
        return;
    }
    //还书
    if (books[bookIndex].borrowed <= 0 || members[memberIndex].borrowedNum <= 0) {
        printf("No books borrowed!\n");
        return;
    }
    books[bookIndex].borrowed--;
    members[memberIndex].borrowedNum--;
    printf("Return book successfully!\n");
}

//添加会员
void addMember() {
    if (memberNum >= 100) {
        printf("The library is full!\n");
        return;
    }
    printf("Please enter the member id: ");
    scanf("%s", members[memberNum].id);
    printf("Please enter the member name: ");
    scanf("%s", members[memberNum].name);
    members[memberNum].borrowedNum = 0;
    memberNum++;
    printf("Add member successfully!\n");
}

//查询会员
void queryMember() {
    char id[10];
    printf("Please enter the member id: ");
    scanf("%s", id);
    for (int i = 0; i < memberNum; i++) {
        if (strcmp(members[i].id, id) == 0) {
            printf("id: %s name: %s borrowedNum: %d\n", members[i].id, members[i].name, members[i].borrowedNum);
            return;
        }
    }
    printf("Member not found!\n");
}

//删除会员
void deleteMember() {
    char id[10];
    printf("Please enter the member id: ");
    scanf("%s", id);
    for (int i = 0; i < memberNum; i++) {
        if (strcmp(members[i].id, id) == 0) {
            for (int j = i; j < memberNum - 1; j++) {
                members[j] = members[j + 1];
            }
            memberNum--;
            printf("Delete member successfully!\n");
            return;
        }
    }
    printf("Member not found!\n");
}

//查询已借阅图书
void queryBorrowed() {
    char memberId[10];
    printf("Please enter the member id: ");
    scanf("%s", memberId);
    int memberIndex = -1;
    for (int i = 0; i < memberNum; i++) {
        if (strcmp(members[i].id, memberId) == 0) {
            memberIndex = i;
            break;
        }
    }
    if (memberIndex == -1) {
        printf("Member not found!\n");
        return;
    }
    printf("Borrowed books of member %s:\n", memberId);
    for (int i = 0; i < bookNum; i++) {
        if (strcmp(books[i].id, memberId) == 0) {
            printf("id: %s name: %s author: %s amount: %d borrowed: %d\n", books[i].id, books[i].name, books[i].author, books[i].amount, books[i].borrowed);
        }
    }
}

注意：以上代码仅为示例，可能存在一些不足之处，如有需要，请根据自己的需求进行修改和完善。