图书管理系统的c实现用于图书信息的管理。
图书管理系统的c实现
用于图书信息的管理。包括图书信息的创建、图书信息的打印、图书信息的查询、图书信息的修改、图书信息的删除。方便用户整理图书,查询图书。
这个图书管理系统是由单链表这一数据结构实现的,板块包括图书信息的创建、打印、查询、修改、删除、以及图书价格的排序等组成。 代码后面也有注释的,基本很好理解的。
下面为源代码:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//3.数据的设计
//3.1程序的数据存储--->容器
//3.2数据的结构 --->图书的信息
struct bookInfo
{
char name[20]; //书名
float price; //书籍的价格
int num; //书籍的数量
};
//定义链表
struct Node
{
struct bookInfo data;
struct Node* next;
};
struct Node* list = NULL; //将链表声明成全局变量
//创建表头:表头就是结构体变量
struct Node* createHead()
{
//动态内存申请
struct Node* headNode = (struct Node*)malloc(sizeof(struct Node));
//变量初始化
headNode->next = NULL;
return headNode;
}
//创建节点:为插入做准备
// 把用户的数据变成结构体变量
struct Node* createNode(struct bookInfo data)
{
struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
newNode->data = data;
newNode->next = NULL;
return newNode;
}
//数据插入(头插法)
void insertNodeByHead(struct Node* headNode, struct bookInfo data)
{
struct Node* newNode = createNode(data);
newNode->next = headNode->next;
headNode->next = newNode;
}
//尾插法
/*struct insertNodeByTall(struct Node* headNode, int data)
{
struct Node* pMove = headNode;
while (pMove != NULL)
{
pMove = pMove->next;
}
struct Node* newNode = createHead(data);
pMove->next = newNode;
}*/
//指定删除(删除链表中元素)
//posLeftNode->next=posNode->next;
//free(posNode);
void deleteNodeByName(struct Node* headNode, char* bookname)
{
struct Node* posLeftNode = headNode;
struct Node* posNode = headNode->next;
//书籍名字是字符串,字符串比较函数
while (posNode != NULL && strcmp(posNode->data.name, bookname))
{
posLeftNode = posNode;
posNode = posLeftNode->next;
}
//讨论查找的结果
if (posNode == NULL)
return;
else
{
printf("删除成功!\n");
posLeftNode->next = posNode->next;
free(posNode);
posNode = NULL;
}
}
//查找
struct Node* searchByName(struct Node* headNode, char* bookName)
{
struct Node* posNode = headNode->next;
while (posNode != NULL && strcmp(posNode->data.name, bookName))
{
posNode = posNode->next;
}
return posNode;
}
//打印链表
void printList(struct Node* headNode)
{
struct Node* pMove = headNode->next;
printf("书名\t价格\t数量\n");
while (pMove != NULL)
{
printf("%s\t%.1f\t%d\n", pMove->data.name, pMove->data.price, pMove->data.num);
pMove = pMove->next;
}
}
//直接文件操作
//文件写操作
void saveInfoToFile(const char* filename, struct Node* headNode)
{
FILE* fp = fopen(filename, "w");
struct Node* pMove = headNode->next;
while (pMove != NULL)
{
fprintf(fp, "%s\t%.1f\t%d\n", pMove->data.name, pMove->data.price, pMove->data.num);
pMove = pMove->next;
}
fclose(fp);
}
//文件读操作
void readInfoFromFile(const char* fileName, struct Node* headNode)
{
FILE* fp = fopen(fileName, "r");
if (fp == NULL)
{
//不存在就创建出来这个文件
fp = fopen(fileName, "w+");
}
struct bookInfo tempData;
while (fscanf(fp, "%s\t%f\t%d\n", tempData.name, &tempData.price, &tempData.num) != EOF)
{
insertNodeByHead(list, tempData);
}
fclose(fp);
}
//冒泡排序(链表)
void bubbleSortList(struct Node* headNode)
{
for (struct Node* p = headNode->next; p != NULL; p = p->next)
{
for (struct Node* q = headNode->next; q->next != NULL; q = q->next)
{
if (q->data.price > q->next->data.price)
{
//交换值
struct bookInfo tempData = q->data;
q->data = q->next->data;
q->next->data = tempData;
}
}
}
printList(headNode);
}
//2.交互
void keyDown()
{
int userkey = 0;
struct bookInfo tempBook; //产生一个临时的变量存储书籍信息
struct Node* result = NULL;
scanf("%d", &userkey);
switch (userkey) {
case 0:
printf(" 【 登记 】 \n");
printf("输入书籍的信息(name,price,num):");
scanf("%s%f%d", tempBook.name, &tempBook.price, &tempBook.num);
insertNodeByHead(list, tempBook);
saveInfoToFile("bookinfo.txt", list);
break;
case 1:
printf(" 【 浏览 】 \n");
printList(list);
break;
case 2:
printf(" 【 借阅 】 \n");
printf("请输入你要借阅的书籍:");
scanf("%s", tempBook.name);
result = searchByName(list,tempBook.name);
if (result == NULL)
printf("没有相关书籍无法借阅!\n");
else
{
if (result->data.num > 0)
{
result->data.num--;
printf("借阅成功\n");
saveInfoToFile("bookinfo.txt", list);
}
else
{
printf("当前书籍无库存,借阅失败!\n");
}
}
break;
case 3:
printf(" 【 归还 】 \n");
printf("请输入你要归还的书籍:");
scanf("%s", tempBook.name);
result = searchByName(list, tempBook.name);
if (result == NULL)
printf("书籍来源非法!\n");
else
{
result->data.num++;
printf("书籍归还成功!\n");
saveInfoToFile("bookinfo.txt", list);
}
break;
case 4:
printf(" 【 查找 】 \n");
printf("你要查询的书名:");
scanf("%s", tempBook.name);
result = searchByName(list, tempBook.name);
if (result == NULL)
{
printf("未找到相关结果!\n");
}
else
{
printf("书名\t价格\t数量\n");
printf("%s\t%.1f\t%d\n", result->data.name, result->data.price, result->data.num);
}
break;
case 5:
printf(" 【 排序 】 \n");
bubbleSortList(list);
break;
case 6:
printf(" 【 删除 】 \n");
printf("输入想要删除的书名:");
scanf("%s", tempBook.name);
deleteNodeByName(list, tempBook.name);
saveInfoToFile("bookinfo.txt", list);
break;
case 5:
printf(" 【 排序 】 \n");
bubbleSortList(list);
break;
case 6:
printf(" 【 删除 】 \n");
printf("输入想要删除的书名:");
scanf("%s", tempBook.name);
deleteNodeByName(list, tempBook.name);
saveInfoToFile("bookinfo.txt", list);
break;
case 7:
printf(" 【 退出 】 \n");
printf(" 退出成功 \n");
system("pause");
exit(0); //关掉整个程序
break;
default:
printf(" 【 error 】 \n");
break;
}
}
//1.界面--->菜单--->模块
void makeMenu()
{
printf("----------------------------------\n");
printf(" Eugeo图书管理借阅系统\n");
printf("t0.登记书籍\n");
printf("t1.浏览书籍\n");
printf("t2.借阅书籍\n");
printf("t3.归还书籍\n");
printf("t4.查找书籍\n");
printf("t5.排序书籍\n");
printf("t6.删除书籍\n");
printf("t7.退出系统\n");
printf("----------------------------------\n");
printf("请输入(0~7):");
}
int main()
{
list = createHead(); //链表初始化
readInfoFromFile("bookinfo.txt", list);
while (1)
{
makeMenu();
keyDown();
system("pause");
system("cls");
}
}