试用C++设计一学生校园消费记录系统

好的，以下是一个简单的学生校园消费记录系统的设计：

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

using namespace std;

class Student {
public:
    Student(string name, int id) {
        this->name = name;
        this->id = id;
        this->balance = 0;
    }
    
    string getName() {
        return name;
    }
    
    int getId() {
        return id;
    }
    
    double getBalance() {
        return balance;
    }
    
    void addBalance(double amount) {
        balance += amount;
    }
    
private:
    string name;
    int id;
    double balance;
};

class Transaction {
public:
    Transaction(Student* student, string type, double amount) {
        this->student = student;
        this->type = type;
        this->amount = amount;
    }
    
    Student* getStudent() {
        return student;
    }
    
    string getType() {
        return type;
    }
    
    double getAmount() {
        return amount;
    }
    
private:
    Student* student;
    string type;
    double amount;
};

class TransactionRecord {
public:
    void addTransaction(Transaction* transaction) {
        transactions.push_back(transaction);
    }
    
    vector<Transaction*> getTransactions() {
        return transactions;
    }
    
private:
    vector<Transaction*> transactions;
};

int main() {
    // 创建学生对象
    Student* s1 = new Student("张三", 1001);
    Student* s2 = new Student("李四", 1002);
    
    // 进行消费记录
    Transaction* t1 = new Transaction(s1, "购物", -50);
    Transaction* t2 = new Transaction(s2, "充值", 100);
    Transaction* t3 = new Transaction(s1, "餐饮", -30);
    
    // 创建消费记录对象，并添加记录
    TransactionRecord* record = new TransactionRecord();
    record->addTransaction(t1);
    record->addTransaction(t2);
    record->addTransaction(t3);
    
    // 输出每个学生的消费记录和余额
    cout << s1->getName() << "的消费记录：" << endl;
    double balance1 = s1->getBalance();
    for (auto t : record->getTransactions()) {
        if (t->getStudent() == s1) {
            cout << t->getType() << "\t" << t->getAmount() << endl;
            balance1 += t->getAmount();
        }
    }
    cout << "余额：" << balance1 << endl;
    
    cout << s2->getName() << "的消费记录：" << endl;
    double balance2 = s2->getBalance();
    for (auto t : record->getTransactions()) {
        if (t->getStudent() == s2) {
            cout << t->getType() << "\t" << t->getAmount() << endl;
            balance2 += t->getAmount();
        }
    }
    cout << "余额：" << balance2 << endl;
    
    return 0;
}

该程序中，使用了三个类：`Student`表示学生，`Transaction`表示一次消费记录，`TransactionRecord`表示所有消费记录。在主函数中，首先创建两个学生对象，然后进行三次消费记录，并将其添加到消费记录对象中。最后，遍历所有消费记录，输出每个学生的消费记录和余额。

该程序还有很多可以扩展和优化的地方，例如可以添加更多的消费类型和消费限制，可以使用文件或数据库来保存消费记录等。