好吧问答库 > C++程序 要求：1.书屋有40个有效用户，普通用户编号从1-39，1-9号用户能借阅的最大书本数量为5,10-39号用

C++程序 要求：1.书屋有40个有效用户，普通用户编号从1-39，1-9号用户能借阅的最大书本数量为5,10-39号用

2024年11月20日 00:39
有2个网友回答
网友（1）：

//基本上80%符合了，最后一个管理库存函数没写，不知道是什么意思
//lib.h
#ifndef LIB_H
#define LIB_H

#include
#include
#include
#include
#include
#include
using namespace std;

struct User;
class Library{
public:
Library(string lib_file);

void proceedLoadingData(const string &file);
void popMenu(string user_name = string());
void proceedOPtions(int option, string &user_name);

User *findUser(const string &user_name);

void userRegister();
void userLogin();
void lookUpBorrowedBook(const string &user_name);
void lookUpBorrowedHistory(const string &user_name);
void addBorrowingBook(const string &user_name);
void deleteBorrowedBook(const string &user_name);
void modifiedUserPassword(const string &user_name);
void manageLibrary();

void saveAndExit();

static int max_user;

private:
string data_file;

User *m_user;
int m_userSize;

User *m_loginUser;
};

struct User{
User();

string name;
int number;
string password;
int borrowed;
string history;
string book_isbn;
};
#endif

//lib.cpp
#include "lib.h"

#include

int Library::max_user = 40;

Library::Library(string lib_file)
:data_file(lib_file), m_loginUser(NULL){
proceedLoadingData(lib_file);

if(m_userSize == 0){
m_user = new User[40];
m_user[0].name = "Admin";
m_user[0].password = "Admin";
m_user[0].number = 0;
m_user[0].borrowed = 0;
m_user[0].book_isbn = "null";
m_user[0].history = "null";

m_userSize++;
}
}

void Library::proceedLoadingData(const string &file){
ifstream fin;
fin.open(file.c_str());
if(!fin)
return;

int num_user = 0;
while(fin.peek() != EOF){
string line;
getline(fin, line);
num_user++;
}

fin.clear();
fin.seekg(0);

m_user = new User[40];

num_user = 0;
while(fin.peek() != EOF){
string line;
getline(fin, line);
stringstream s_line(line);

s_line >> m_user[num_user].name >> m_user[num_user].password
>> m_user[num_user].number >> m_user[num_user].borrowed
>> m_user[num_user].book_isbn >> m_user[num_user].history;

num_user++;
if(num_user == Library::max_user)
break;
}

m_userSize = num_user;
fin.close();
}

void Library::popMenu(string user_name){
const string menu1 = "==========书屋管理系统============\n1。添加新用户\n2。登录用户\n3。退出\n";
const string menu2 = "==========书屋管理系统============\n1。查看借书记录\n2。查看已借书本\n3。添加借书\n4。注销借书\n5。修改密码\n6。退出\n";
const string menu3 = "==========书屋管理系统============\n1。管理书屋库存\n2。退出\n";

cin.sync();
cin.clear();
if(user_name.empty())
cout << menu1;
else if (user_name == "Admin")
cout << menu3;
else
cout << menu2;

cout << "请选择：";
int option;
cin >> option;
proceedOPtions(option, user_name);
}

void Library::proceedOPtions(int option, string &user_name){
switch(option){
case 1:
{
if(user_name.empty())
userRegister();
else if (user_name == "Admin")
manageLibrary();
else
lookUpBorrowedHistory(user_name);

break;
}
case 2:
{
if(user_name.empty())
userLogin();
else if(user_name == "Admin")
saveAndExit();
else
lookUpBorrowedBook(user_name);

break;
}
case 3:
{
if(user_name.empty())
saveAndExit();
else if(user_name == "Admin")
cout << "选择错误!" << endl;
else
addBorrowingBook(user_name);

break;
}
case 4:
{
if(user_name.empty() || user_name == "Admin")
cout << "选择错误!" << endl;
else
deleteBorrowedBook(user_name);

break;
}
case 5:
{
if(user_name.empty() || user_name == "Admin")
cout << "选择错误!" << endl;
else
modifiedUserPassword(user_name);

break;
}
case 6:
{
if(user_name.empty() || user_name == "Admin")
cout << "选择错误!" << endl;
else
saveAndExit();

break;
}
default:
cout << "选择错误!" << endl;
}

if(m_loginUser)
user_name = m_loginUser->name;

popMenu(user_name);
}

void Library::userRegister(){
if (m_userSize >= max_user)
{
cout << "用户数已经达到最大!" << endl;
return;
}

string user_name, user_password;

while(true){
cout << "请输入用户名：";
cin >> user_name;

for (int i = 0; i < m_userSize; i++)
{
if(m_user[i].name == user_name){
cout << "用户名已存在!" << endl;
continue;
}
}

break;
}

cout << "请输入密码：";
cin >> user_password;

m_user[m_userSize].name = user_name;
m_user[m_userSize].password = user_password;
m_user[m_userSize].number = m_userSize;
m_user[m_userSize].borrowed = 0;
m_user[m_userSize].book_isbn = "null";
m_user[m_userSize].history = "null";
m_userSize++;

cout << "注册成功!" << endl;
}

void Library::userLogin(){
string user_name;
cout << "请输入用户名：";
cin >> user_name;

for(int i = 0; i < m_userSize; i++){
if(m_user[i].name == user_name){
string password;
while(true){
cout << "请输入密码：";
cin >> password;

if(password != m_user[i].password)
cout << "密码错误!" << endl;
else
break;
}

m_loginUser = &m_user[i];
cout << "登陆成功!" << endl;
return;
}
}

cout << "没有此用户!" << endl;
return;
}

void Library::lookUpBorrowedBook(const string &user_name){
User *user = findUser(user_name);
cout << user->book_isbn << endl;
}

void Library::lookUpBorrowedHistory(const string &user_name){
User *user = findUser(user_name);
cout << user->history << endl;
}

void Library::deleteBorrowedBook(const string &user_name){
User *user = findUser(user_name);
string delete_isbn;
while(true){
cout << "请输入要删除的书本编号：";
cin >> delete_isbn;

if (user->book_isbn.find(delete_isbn) == string::npos)
cout << "没有此书本编号!" << endl;
else{
user->book_isbn.replace(user->book_isbn.find(delete_isbn), delete_isbn.size(), "");
user->borrowed--;

cout << "删除成功!" << endl;
break;
}
}
}

void Library::addBorrowingBook(const string &user_name){
User *user = findUser(user_name);

if(((user->number>=1 && user->number<=9) && user->borrowed>=5) ||
((user->number>=10 && user->number<=39) && user->borrowed>=3)){
cout << "已到达最大借书量!" << endl;
return;
}

string book_isbn;
cout << "请输入要借的书本编号：";
cin >> book_isbn;

user->book_isbn == "null" ? user->book_isbn = book_isbn : user->book_isbn.append("," + book_isbn);
user->history == "null" ? user->history = book_isbn : user->history.append("," + book_isbn);

user->borrowed++;
}

void Library::modifiedUserPassword(const string &user_name){
User *user = findUser(user_name);
string passowrd;

while(true){
cout << "请输入旧密码：";
cin >> passowrd;
if (passowrd != user->password)
cout << "密码不正确!" << endl;
else
break;
}

string check_password;
do{
cout << "请输入新密码：";
cin >> passowrd;
cout << "请再次输入新密码：";
cin >> check_password;
}while(passowrd != check_password);

user->password = passowrd;
cout << "修改成功!" << endl;
}

User *Library::findUser(const string &user_name){
for (int i = 0; i < m_userSize; i++)
{
if(m_user[i].name == user_name)
return &m_user[i];
}

cerr << "寻找用户出现异常!程序终止!" << endl;
return NULL;
}

void Library::manageLibrary(){

}

void Library::saveAndExit(){
ofstream fout;
fout.open(data_file.c_str(), ios::out|ios::trunc);

for(int i = 0; i < m_userSize; i++){
fout << m_user[i].name << " " << m_user[i].password << " "
<< m_user[i].number << " " << m_user[i].borrowed << " "
<< m_user[i].book_isbn << " " << m_user[i].history << endl;
}
fout.close();

exit(0);
}

User::User(){
number = 0;
password = "user";
}
//main.cpp
#include "lib.h"

#include

int main(){
string file_path = "lib.txt";
fstream fin;
fin.open(file_path.c_str());
if(!fin){
cout << "默认路径不正确，请手动输入载入数据路径：";
cin >> file_path;
}

Library *library = new Library(file_path);
library->popMenu();
return 0;
}

网友（2）：

在吗？ 在的话hi我

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