标准C语言实现一个图书管理系统-C语言技术文档 - Firnow fir低通滤波器c语言

/*

Project design

Using link_list to realize the booklibary Management System

Library is a place that provide students to borrow and return.The books information is very important for students.

Now design a project to Imitate the library and can retrieve information fastly.

The books have this type of structure which are book_id ,bookname,book type,books_status.

You can define structure and program as following.

1) add books

2) list books

3) search books

4) borrow books

5) return books

6) exit

add books : you can type from keyboard to input books information one by one.

Each book should be given some prompt ,for example : “you input the 1str book id :” and so on.

List books : after you select 2,then display all books according to certain format

Search books : you can select some books according to book name or book type.So you should create sub menu to selected.

Borrow books: means borrow some books from library,so in the library the book status will be edited to having borrowed.

return books: put the books status change no having borrowed.

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define BORROWED 1

#define NOBORROW 0

/* 定义图书结构 */

struct Book

{

int _id; // 编号,唯一

char _name[32]; // 图书的名称,不唯一

int _type; // 图书的类型,不唯一

int _status; // 图书的状态,借出/没有借出

int _count; // 图书借出的次数

struct Book* _next; // 下一本书

struct Book* _prev; // 上一本书

};

/* 定义图书类型 */

typedef struct Book Book;

/* 操作的目录提示 */

char book_menu[][32] =

{

"add books",

"list books",

"search books",

"borrow books",

"return books",

"exit",

"",

};

/* 操作的目录提示1 */

char book_menu_sub[][32] =

{

"search books by name",

"search books by type",

"",

};

/* 添加图书类型,用户信息显示 */

char book_types[][32] =

{

"type0",

"type1",

"type2",

"",

};

/* 添加图书状态,用户信息显示 */

char book_status[][32] =

{

"noborrow",

"borrowed",

"",

};

/* 增加图书,id自动排号 */

int add_books(Book* head, Book* book_for_add)

{

Book* p = head;

if (!p)

return -1;

while (p->_next)

{

p = p->_next;

};

p->_next = book_for_add;

book_for_add->_id = p->_id+1;

book_for_add->_prev = p;

book_for_add->_next = NULL;

book_for_add->_count = 0;

book_for_add->_status = 0;

return 0;

};

/* 建立图书管理链表 */

Book* create_list(Book* book_head)

{

if (book_head)

{

book_head->_prev = book_head;

book_head->_next = NULL;

book_head->_id = 1;

book_head->_count = 0;

book_head->_status = 0;

}

return book_head;

}

/* 释放链表 */

void free_list(Book* book_head)

{

Book *p, *p1;

p = book_head;

while(p)

{

p1 = p->_next;

free(p);

p = p1;

}

}

/* 打印图书信息 */

void print_book(Book* book)

{

printf("id:%d, name:%s, type:%s, status:%s, times:%d n",

book->_id, book->_name, book_types[book->_type],

book_status[book->_status], book->_count);

}

/* 列出所有登记的图书 */

void list_books(Book* book_head)

{

Book* p = book_head;

while (p)

{

print_book(p);

p = p->_next;

}

}

/* 借书,返回该书的指针,否则就返回NULL,可能不存在图书,或者已经被借走了 */

Book* borrow_books(Book* book_head, int id)

{

Book* p = book_head;

while (p)

{

if (p->_id == id)

break;

p = p->_next;

}

if (!p)/* 不存在 */

return NULL;

if (p->_status != 0) /* 已经被借走 */

return NULL;

p->_status = 1; /* 借书登记 */

p->_count++; /* 被借阅次数+1 */

return p;

}

/* 查找书名称,返回查找到的数量,书名可能有重复的,一本书可能也有很多本,但是ID却是唯一的 */

int search_books_by_name(Book* book_head, char* name)

{

int count = 0;

Book* p = book_head;

while (p)

{

if (strcmp(p->_name, name) == 0)

{

print_book(p);

++count;

}

p = p->_next;

}

return count;

}

/* 查找书类型,返回查找到的数量,一个类型会有很多书 */

int search_books_by_type(Book* book_head, int type)

{

int count = 0;

Book* p = book_head;

while (p)

{

if (p->_type == type)

{

print_book(p);

++count;

}

p = p->_next;

}

return count;

}

/* 还书,正常归还就返回该书的指针,否则就返回NULL */

Book* return_books(Book* book_head, int id)

{

Book* p = book_head;

while (p)

{

if (p->_id == id && p->_status != 0)

{

p->_status = 0; /* 还书登记 */

break;

}

p = p->_next;

}

return p;

}

/* 打印操作选项 */

void print_menu(char menus[][32])

{

int no = 0;

printf("nPLEASE SELECT ID LIKE 1 or 2 ..n");

while (strlen(menus[no]))

{

printf("%d t%sn", no+1, menus[no]);

++no;
标准C语言实现一个图书管理系统-C语言技术文档 - Firnow fir低通滤波器c语言

}

printf("OPTION(");

while (no)

{

printf("/%d", no--);

}

printf("):");

}

/* 主函数 */

int main(void)

{

char key = 0;

char ss[128];

int loop = 1;

Book first_book, *pBooks, *pTmp;

strcpy(first_book._name, "nihao");

first_book._type = 0;

pBooks = create_list(&first_book);

while (loop)

{

print_menu(book_menu);

gets(ss);

key = ss[0] - 48;

if(key < 0 || key > 6)

printf("Error input !n");

else

printf("INPUT:%dn", key);

switch (key)

{

case 1: // add books

pTmp = (Book*)malloc(sizeof(Book));

if(pTmp)

{

printf("Add_Book input name:");

gets(ss);

strncpy(pTmp->_name, ss, 31);

print_menu(book_types);

gets(ss);

key = ss[0] - 48;

if(key <= 0 || key > (sizeof(book_types)/32) )

key = 1;

pTmp->_type = key - 1;

add_books(pBooks, pTmp);

}

break;

case 2: // list books

list_books(pBooks);

break;

case 3: // search books

print_menu(book_menu_sub);

gets(ss);

key = ss[0] - 48;

printf("INPUT:%dn", key);

switch (key)

{

case 1: // search books by name

printf("input book name:");

gets(ss);

key = search_books_by_name(pBooks, ss);

if(key == 0)

printf("no found!n");

case 2: // search books by type

print_menu(book_types);

gets(ss);

key = ss[0] - 48;

key = search_books_by_type(pBooks, key-1);

if(key == 0)

printf("no found!n");

default:

break;

}

break;

case 4: // borrow books

printf("Borrow books, input book id:");

gets(ss);

key = atoi(ss);

pTmp = borrow_books(pBooks, key);

if (!pTmp)

printf("borrow books failed: %dn", key);

else

{

printf("borrow books successful!n");

print_book(pTmp);

}

break;

case 5: // return books

printf("Return books, input book id:");

gets(ss);

key = atoi(ss);

pTmp = return_books(pBooks, key);

if (!pTmp)

printf("return books failed: %dn", key);

else

{

printf("return books successful!n");

print_book(pTmp);

}

break;

case 6: // exit

loop = 0;

break;

default:

break;

}

printf("--pause--");

gets(ss);

}

free_list(pBooks);

return 0;

}

  

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