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题目描述

要求：模拟书店销售管理，每本图书的信息包括ISBN号、书名 、单价、库存量等 ，请设计程序，至少完成书店图书的初始数据录入、修改单价或库存、按书名关键字查询图书等功能。

实验步骤

1、编写图书信息类 2、编写图书销售管理员 3、编写销售类中的函数，实现初始数据的录入（写文件）； 4、编写销售类中的函数，当输入书名关键字时，可输出书名中包含此关键字的所有图书信息。 5、编写销售类中的函数，输入ISBN号时，可修改此图书的库存（或单价） 6、编写主函数，显示主菜单，根据用户的选择，调用销售管理员的相关代码完成指定的功能； 7、测试程序。

第一版：不通过文件流

#include
   
    #include
    
     #include
     
      using namespace std;const int MAX = 500;/*每本图书的信息包括ISBN号、书名 、单价、库存量请设计程序，至少完成书店图书的初始数据录入、修改单价或库存、按书名关键字查询图书等功能。实验步骤1、编写图书信息类2、编写图书销售管理员3、编写销售类中的函数，实现初始数据的录入（写文件）；4、编写销售类中的函数，当输入书名关键字时，可输出书名中包含此关键字的所有图书信息。5、编写销售类中的函数，输入ISBN号时，可修改此图书的库存（或单价）6、编写主函数，显示主菜单，根据用户的选择，调用销售管理员的相关代码完成指定的功能；7、测试程序。*/fstream shu("book.txt", ios::in | ios::out);class Book{
   	string isbn;	string name;	double price;	unsigned long nums;	friend class XS;public:	Book(string isbn, string name, double price, unsigned long nums) :isbn(isbn),		name(name), price(price), nums(nums){
   	}	void print(){
   		cout << "ISBN= " << isbn << " name= " << name << " price= " << price << " nums=" << nums << endl;	}	void rxiuprice(double price_){
   		price = price_;	}	void rxiunums(unsigned long num){
   		nums = num;	}};class XS{
   //销售类 	Book *p[MAX];	public:	static unsigned long totalbooks;	void add(Book* b){
   		if (b != NULL){
   			p[totalbooks] = b;			totalbooks++;			cout << "添加成功" << endl;		}	}	void addbook(){
   		string isbn;		string name;		double price;		unsigned long nums;		cout << "输入书籍的信息:" << endl;;		cin >> isbn >> name >> price >> nums;		p[totalbooks] = new Book(isbn, name, price, nums);		totalbooks++;		cout << "添加成功" << endl;	}	void showbook(){
   		cout << "请输入书名：";		string name;		cin >> name;		int i = 0;		for (i = 0; i < totalbooks; ++i){
   			if ((*(p + i))->name == name){
   				break;			}		}		(*(p + i))->print();	}	void showallbook(){
   		int i = 0;		for (i = 0; i < totalbooks; ++i){
   			//cout << "i= "<
      << endl;			(*(p + i))->print();		}	}	void cinbisn(){
   		int i = 0;		string bisn;		cout << "输入ISBN码：";		cin >> bisn;		for (i=0; i < totalbooks; ++i){
   			if ((*(p + i))->isbn == bisn){
   				break;			}		}		cout << "1.修改单价\n2.修改库存" << endl;		int cina;		cin >> cina;		if (cina == 1){
   			double prince = 0;			cout << "修改单价为:";			cin >> prince;			(*(p + i))->rxiuprice(prince);			cout << "修改单价成功" << endl;		}		else if (cina == 2){
   			unsigned long nums;			cout << "修改库存为:";			cin >> nums;			(*(p + i))->rxiunums(nums);			cout << "修改库存成功" << endl;		}		else		{
   			cout << "输入错误不发生修改" << endl;		}			}};unsigned long XS::totalbooks = 0;/*31 a 30 302 b 30 313 cc 32 32*/int main(){
   	unsigned long numss; 	cout << "初始化书本的数量:";	cin >> numss;	Book *p;	XS xs;	string isbn;	string name;	double price;	unsigned long nums;	for (int i = 0; i < numss; ++i){
   		p = NULL;		cin >> isbn >> name >> price >> nums;		p = new Book(isbn, name, price, nums);		xs.add(p);	}	cout << "size= " << xs.totalbooks << endl;	int ch;	while (true)	{
   		cout << "-----------------------菜单----------------------        " << endl;		cout << "               1.添加书本                                " << endl;		cout << "               2.修改书籍                                " << endl;		cout << "               3.查找书籍                                " << endl;		cout << "               4.显示所有书籍                            " << endl;	//	cout << "               5.                                " << endl;		cin >> ch;		switch (ch)		{
   		case 1:			xs.addbook();			break;		case 2:			xs.cinbisn();			break;		case 3:			xs.showbook();			break;		case 4:			xs.showallbook();			break;		default:			break;		}	}	return 0;}
     
    
   

第二版

经过文件，可储存修改

~~

注意： 需要在vs里面运行，dev不行，需要创建book.dat文件，txt格式可能会发生错误

~~

#include
   
    #include
    
     #include
     
      using namespace std;const int MAX = 500;fstream shu;void init(){
   	shu.open("book.dat", ios::in | ios::out | ios::binary);}class Book{
   	friend class XS;public:	string isbn;	string name;	double price;	unsigned long nums;	Book(){
   	}	Book(string isbn, string name, double price, unsigned long nums) :isbn(isbn),		name(name), price(price), nums(nums){
   	}	void print(){
   		printf("isbn:%-5s  书名:%-5s   价格:%-5.lf   库存:%lu\n", isbn, name, price, nums);	}	void rxiuprice(double price_){
   		price = price_;	}	void rxiunums(unsigned long num){
   		nums = num;	}};int gethang(){
   	int num = 0;	shu.seekg(0, ios::end);	num = shu.tellg() / sizeof(Book);	return num;}class XS{
   //销售类 	Book p[MAX];public:	static unsigned long totalbooks;	void addbook(){
   		string isbn;		string name;		double price;		unsigned long nums;		cout << "输入书籍的信息:" << endl;;		cin >> isbn >> name >> price >> nums;		Book book(isbn, name, price, nums);		totalbooks++;		shu.seekp((totalbooks - 1)*sizeof(Book), ios::beg);		shu.write((char*)&book, sizeof(Book));		shu.flush();		cout << "size = " << totalbooks << endl;		cout << "添加成功" << endl;	}	void showbook(){
   		cout << "请输入书名：";		string name;		cin >> name;		shu.seekg(0, ios::end);		totalbooks = shu.tellg() / sizeof(Book);		shu.seekg(0);		for (int i = 0; i
      
       > bisn;		Book book;		shu.seekg(0);		int  i = 0;		for ( i= 0; i < size;++i)		{
   			shu.read((char*)&book, sizeof(Book));				if (book.isbn == bisn){
   					break;				}		}		cout << "i=" << i << "book is " << book.isbn << "name =" << book.name << endl;		cout << "1.修改单价\n2.修改库存" << endl;		int cina;		cin >> cina;		if (cina == 1){
   			double prince = 0;			cout << "修改单价为:";			cin >> prince;			book.rxiuprice(prince);			shu.seekp(sizeof(Book)*i, ios::beg);			shu.write((char*)&book, sizeof(Book));			shu.flush();			cout << "修改单价成功" << endl;		}		else if (cina == 2){
   			unsigned long nums;			cout << "修改库存为:";			cin >> nums;			book.rxiunums(nums);			shu.seekp(sizeof(Book)*i, ios::beg);			shu.write((char*)&book, sizeof(Book));				shu.flush();			cout << "修改库存成功" << endl;		}		else		{
   			cout << "输入错误不发生修改" << endl;		}	}};unsigned long XS::totalbooks = 0;int main(){
   	init();	if (shu.fail()){
   		cout << "打开文件失败" << endl;		exit(0);	}	XS xs;	shu.seekg(0, ios::end);	xs.totalbooks = shu.tellg() / sizeof(Book);	cout << "size= " << xs.totalbooks << endl;	int ch;	while (true)	{
   		cout << "-----------------------菜单------------------------|" << endl;		cout << "|               1.添加书本                         |" << endl;		cout << "|               2.修改书籍                         |" << endl;		cout << "|               3.查找书籍                         |" << endl;		cout << "|               4.显示所有书籍                     |" << endl;		cout << "|               5.保存并退出程序                   | " << endl;		cout << "|--------------------------------------------------|" << endl;		cout << "输入选项:";		cin >> ch;		switch (ch)		{
   		case 1:			xs.addbook();			cout << "size= " << xs.totalbooks << endl;			break;		case 2:			xs.cinbisn();			break;		case 3:			xs.showbook();			break;		case 4:			xs.showallbook();			break;		case 5:			shu.flush();			shu.close();			return 0;		default:			break;		}	}	shu.close();	return 0;}
      
     
    
   

运行截图

第三版： 新增加两个功能 1.添加按书名或者ISBN码删除书籍 2.添加删除所有书籍;

#include
   
    #include
    
     #include
     
      using namespace std;fstream shu;void init(){
   	shu.open("book.dat", ios::in | ios::out | ios::binary);	if (shu.fail()){
   		shu.open("book.dat",ios::out | ios::binary);		shu.close();		shu.open("book.dat", ios::in | ios::out | ios::binary);		if (shu.is_open()){
   			cout << "创建文件成功"<< endl;		}		else{
   			cout << "打开文件失败" << endl;			exit(0);		}				}}class Book{
   public:	string isbn;	string name;	double price;	unsigned long nums;	Book(){
   	}	Book(string isbn, string name, double price, unsigned long nums) :isbn(isbn),		name(name), price(price), nums(nums){
   	}	void print(){
   		printf("ISBN码: %-5s  书名:《%-5s》   价格:%-3.lf 元  库存: %lu 本\n", isbn, name, price, nums);	}	void rxiuprice(double price_){
   		price = price_;	}	void rxiunums(unsigned long num){
   		nums = num;	}};int gethang(){
   	int num = 0;	shu.seekg(0, ios::end);	num = shu.tellg() / sizeof(Book);	return num;}class XS{
   //销售类 public:	static unsigned long totalbooks;	void addbook(){
   		string isbn;		string name;		double price;		unsigned long nums;		cout << "输入书籍的信息\n" << endl;;		cout << "ISBN码：";		cin >> isbn;		cout << "书名：";		cin >> name;		cout << "价格：";		cin >> price;		cout << "库存：";		cin >> nums;		cout << endl;		Book book(isbn, name, price, nums);		totalbooks++;		shu.seekp((totalbooks - 1)*sizeof(Book), ios::beg);		shu.write((char*)&book, sizeof(Book));		shu.flush();		cout << "size = " << totalbooks << endl;		cout << "添加成功" << endl;	}	void deletebook(){
   		cout << "请输入书名或者isbn码:";		string name;		cin >> name;		fstream shu1("temp.dat", ios::out | ios::binary|ios::trunc);//如果存在则清空			shu.seekg(0, ios::end);	//	cout << "书本数 " << shu.tellg() / sizeof(Book) << endl;		totalbooks = shu.tellg() / sizeof(Book);		shu.seekg(0);		for (int i = 0; i
      
       > name;		shu.seekg(0, ios::end);		totalbooks = shu.tellg() / sizeof(Book);		shu.seekg(0);		for (int i = 0; i
       
        > bisn;		Book book;		shu.seekg(0);		int  i = 0;		for ( i= 0; i < size;++i)		{
   			shu.read((char*)&book, sizeof(Book));				if (book.isbn == bisn){
   					break;				}		}		cout << "i=" << i << "book is " << book.isbn << "name =" << book.name << endl;		cout << "1.修改单价\n2.修改库存" << endl;		int cina;		cin >> cina;		if (cina == 1){
   			double prince = 0;			cout << "修改单价为:";			cin >> prince;			book.rxiuprice(prince);			shu.seekp(sizeof(Book)*i, ios::beg);			shu.write((char*)&book, sizeof(Book));			shu.flush();			cout << "修改单价成功" << endl;		}		else if (cina == 2){
   			unsigned long nums;			cout << "修改库存为:";			cin >> nums;			book.rxiunums(nums);			shu.seekp(sizeof(Book)*i, ios::beg);			shu.write((char*)&book, sizeof(Book));				shu.flush();			cout << "修改库存成功" << endl;		}		else		{
   			cout << "输入错误不发生修改" << endl;		}	}};unsigned long XS::totalbooks = 0;int main(){
   	init();	XS xs;	shu.seekg(0, ios::end);	xs.totalbooks = shu.tellg() / sizeof(Book);	cout << "size= " << xs.totalbooks << endl;	int ch;	while (true)	{
   		cout << "-----------------------菜单------------------------|" << endl;		cout << "|               1.添加书本                         |" << endl;		cout << "|               2.删除书本                         |" << endl;		cout << "|               3.修改书籍                         |" << endl;		cout << "|               4.查找书籍                         |" << endl;		cout << "|               5.显示所有书籍                     |" << endl;		cout << "|               6.删除所有书籍                     |" << endl;		cout << "|               7.保存并退出程序                   | " << endl;		cout << "|--------------------------------------------------|" << endl;		cout << "输入选项:";		cin >> ch;		switch (ch)		{
   		case 1:			xs.addbook();			cout << "书本数：" << xs.totalbooks << endl;			break;		case 2:			xs.deletebook();			cout << "书本数： " << xs.totalbooks << endl;			break;		case 3:			xs.cinbisn();			break;		case 4:			xs.show_one_book();			break;		case 5:			xs.showallbook();			break;		case 6:			xs.deletel_all_book();			cout << "书本数： " << xs.totalbooks << endl;			break;		case 7:			shu.flush();			shu.close();			return 0;		default:			break;		}	}	shu.close();	return 0;}
       
      
     
    
   

截图：

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