c++校园卡管理系统

以下是一个简单的C++校园卡管理系统的实现，包括校园卡类和学生类，实现了消费、充值、转账、查询等功能：

#include <iostream>
#include <string>
#include <vector>
#include <fstream>

using namespace std;

// 校园卡类
class CampusCard {
public:
    CampusCard(string id, double balance = 0.0) : m_id(id), m_balance(balance) {}

    // 充值
    void recharge(double amount) {
        m_balance += amount;
        cout << "充值成功，当前余额为：" << m_balance << endl;
    }

    // 消费
    bool consume(double amount) {
        if (m_balance >= amount) {
            m_balance -= amount;
            cout << "消费成功，当前余额为：" << m_balance << endl;
            m_consumeRecords.push_back(amount);
            return true;
        } else {
            cout << "余额不足，消费失败" << endl;
            return false;
        }
    }

    // 转账
    bool transfer(CampusCard& other, double amount) {
        if (m_balance >= amount) {
            m_balance -= amount;
            other.m_balance += amount;
            cout << "转账成功，当前余额为：" << m_balance << endl;
            return true;
        } else {
            cout << "余额不足，转账失败" << endl;
            return false;
        }
    }

    // 获取余额
    double getBalance() const {
        return m_balance;
    }

    // 获取消费记录
    vector<double> getConsumeRecords() const {
        return m_consumeRecords;
    }

    // 获取校园卡号
    string getId() const {
        return m_id;
    }

private:
    string m_id; // 校园卡号
    double m_balance; // 余额
    vector<double> m_consumeRecords; // 消费记录
};

// 学生类
class Student {
public:
    Student(string id, string name, string password) : m_id(id), m_name(name), m_password(password) {}

    // 登录
    bool login(string password) {
        if (password == m_password) {
            cout << "登录成功" << endl;
            return true;
        } else {
            cout << "密码错误，登录失败" << endl;
            return false;
        }
    }

    // 挂失
    void reportLoss() {
        m_isLost = true;
        cout << "挂失成功" << endl;
    }

    // 解挂
    void cancelLoss() {
        m_isLost = false;
        cout << "解挂成功" << endl;
    }

    // 获取校园卡
    CampusCard& getCampusCard() {
        return m_campusCard;
    }

    // 获取学号
    string getId() const {
        return m_id;
    }

    // 获取姓名
    string getName() const {
        return m_name;
    }

private:
    string m_id; // 学号
    string m_name; // 姓名
    string m_password; // 密码
    bool m_isLost = false; // 是否挂失
    CampusCard m_campusCard; // 校园卡
};

// 根据学号查找学生
Student* findStudentById(const vector<Student>& students, string id) {
    for (auto& student : students) {
        if (student.getId() == id) {
            return &student;
        }
    }
    return nullptr;
}

// 保存学生信息到文件
void saveStudentsToFile(const vector<Student>& students, string filename) {
    ofstream fout(filename);
    for (auto& student : students) {
        fout << student.getId() << " " << student.getName() << " " << student.getCampusCard().getId() << " " << student.getCampusCard().getBalance() << endl;
    }
    fout.close();
}

// 从文件中读取学生信息
vector<Student> readStudentsFromFile(string filename) {
    vector<Student> students;
    ifstream fin(filename);
    string id, name, cardId;
    double balance;
    while (fin >> id >> name >> cardId >> balance) {
        students.emplace_back(id, name, "123456"); // 初始密码为123456
        students.back().getCampusCard() = CampusCard(cardId, balance);
    }
    fin.close();
    return students;
}

int main() {
    vector<Student> students = readStudentsFromFile("students.txt");

    // 登录
    string id, password;
    cout << "请输入学号和密码进行登录：" << endl;
    cin >> id >> password;
    Student* student = findStudentById(students, id);
    while (student == nullptr || !student->login(password)) {
        cout << "登录失败，请重新输入学号和密码：" << endl;
        cin >> id >> password;
        student = findStudentById(students, id);
    }

    // 操作校园卡
    CampusCard& campusCard = student->getCampusCard();
    int choice;
    while (true) {
        cout << "请选择操作：" << endl;
        cout << "1. 充值" << endl;
        cout << "2. 消费" << endl;
        cout << "3. 转账" << endl;
        cout << "4. 查询余额" << endl;
        cout << "5. 查询消费记录" << endl;
        cout << "6. 挂失" << endl;
        cout << "7. 解挂" << endl;
        cout << "8. 退出" << endl;
        cin >> choice;
        switch (choice) {
            case 1: {
                double amount;
                cout << "请输入充值金额：" << endl;
                cin >> amount;
                campusCard.recharge(amount);
                break;
            }
            case 2: {
                double amount;
                cout << "请输入消费金额：" << endl;
                cin >> amount;
                campusCard.consume(amount);
                break;
            }
            case 3: {
                string otherId;
                double amount;
                cout << "请输入转账对象学号和金额：" << endl;
                cin >> otherId >> amount;
                Student* otherStudent = findStudentById(students, otherId);
                if (otherStudent == nullptr) {
                    cout << "转账对象不存在" << endl;
                } else {
                    CampusCard& otherCampusCard = otherStudent->getCampusCard();
                    campusCard.transfer(otherCampusCard, amount);
                }
                break;
            }
            case 4: {
                cout << "当前余额为：" << campusCard.getBalance() << endl;
                break;
            }
            case 5: {
                vector<double> consumeRecords = campusCard.getConsumeRecords();
                cout << "消费记录：" << endl;
                for (auto record : consumeRecords) {
                    cout << record << " ";
                }
                cout << endl;
                break;
            }
            case 6: {
                student->reportLoss();
                break;
            }
            case 7: {
                student->cancelLoss();
                break;
            }
            case 8: {
                saveStudentsToFile(students, "students.txt");
                cout << "退出成功" << endl;
                return 0;
            }
            default: {
                cout << "无效操作，请重新选择" << endl;
                break;
            }
        }
    }

    return 0;
}