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| #include<iostream>
#include<string>
#include<fstream>
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{
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);
shu.seekg(0, ios::end);
totalbooks = shu.tellg() / sizeof(Book);
shu.seekg(0);
for (int i = 0; i<totalbooks; ++i){
Book book;
shu.read((char*)&book, sizeof(Book));
if (name == book.isbn || name == book.name){
continue;
}
else{
shu1.write((char*)&book, sizeof(Book));
}
}
shu1.close();
shu.close();
fstream shu2("temp.dat");
ofstream shu3("book.dat", ios::in | ios::binary|ios::trunc);
for (int i = 0; i<totalbooks-1; ++i){
Book book;
shu2.read((char*)&book, sizeof(Book));
shu3.write((char*)&book, sizeof(Book));
}
shu3.close();
shu2.close();
system("del temp.dat");
init();
cout << "删除成功" << endl;
--totalbooks;
}
void deletel_all_book(){
shu.close();
system("del book.dat");
init();
cout << "删除成功" << endl;
totalbooks = 0;
}
void show_one_book(){
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<totalbooks; ++i){
Book book;
shu.read((char*)&book, sizeof(Book));
if (book.name == name){
book.print();
}
}
}
void showallbook(){
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<totalbooks; ++i){
Book book;
shu.read((char*)&book, sizeof(Book));
book.print();
}
}
void cinbisn(){
shu.seekg(0, ios::end);
int size = shu.tellg() / sizeof(Book);
cout << "size=" << size << endl;
string bisn;
cout << "输入ISBN码：";
cin >> 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;
}
|
