用C++写一个学生信息管理系统，要求用到类、vector容器，能把数据存到txt文件中，并从中读取数据，学生信息包括学号、姓名、性别、班级、家庭地址

好的，下面是一个简单的学生信息管理系统的代码，它使用了C++中的类和vector容器，可以将学生信息存储到txt文件中，并从文件中读取数据：

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
using namespace std;

// 定义学生类
class Student {
public:
    int id;            // 学号
    string name;       // 姓名
    string gender;     // 性别
    string className;  // 班级
    string address;    // 家庭地址

    // 构造函数
    Student(int id = 0, string name = "", string gender = "", string className = "", string address = "") {
        this->id = id;
        this->name = name;
        this->gender = gender;
        this->className = className;
        this->address = address;
    }
};

// 定义学生信息管理类
class StudentManager {
private:
    vector<Student> students;  // 保存学生信息的vector容器

public:
    // 添加学生信息
    void addStudent(Student student) {
        students.push_back(student);
    }

    // 显示所有学生信息
    void showAllStudents() {
        cout << "学号\t姓名\t性别\t班级\t家庭地址" << endl;
        for (int i = 0; i < students.size(); i++) {
            Student student = students[i];
            cout << student.id << "\t" << student.name << "\t" << student.gender << "\t"
                 << student.className << "\t" << student.address << endl;
        }
    }

    // 保存学生信息到文件
    void saveToFile(string filename) {
        ofstream outfile(filename);
        for (int i = 0; i < students.size(); i++) {
            Student student = students[i];
            outfile << student.id << "," << student.name << "," << student.gender << ","
                    << student.className << "," << student.address << endl;
        }
        outfile.close();
    }

    // 从文件中读取学生信息
    void readFromFile(string filename) {
        ifstream infile(filename);
        string line;
        while (getline(infile, line)) {
            int pos1 = line.find(",");
            int pos2 = line.find(",", pos1 + 1);
            int pos3 = line.find(",", pos2 + 1);
            int pos4 = line.find(",", pos3 + 1);
            int id = stoi(line.substr(0, pos1));
            string name = line.substr(pos1 + 1, pos2 - pos1 - 1);
            string gender = line.substr(pos2 + 1, pos3 - pos2 - 1);
            string className = line.substr(pos3 + 1, pos4 - pos3 - 1);
            string address = line.substr(pos4 + 1);
            Student student(id, name, gender, className, address);
            students.push_back(student);
        }
        infile.close();
    }
};

int main() {
    StudentManager manager;
    manager.readFromFile("students.txt");

    while (true) {
        cout << "请选择操作：" << endl;
        cout << "1. 添加学生信息" << endl;
        cout << "2. 显示所有学生信息" << endl;
        cout << "3. 保存学生信息到文件" << endl;
        cout << "4. 退出程序" << endl;
        int choice;
        cin >> choice;
        switch (choice) {
        case 1:
            cout << "请输入学生信息（学号 姓名 性别 班级 家庭地址）：" << endl;
            int id;
            string name, gender, className, address;
            cin >> id >> name >> gender >> className >> address;
            manager.addStudent(Student(id, name, gender, className, address));
            break;
        case 2:
            manager.showAllStudents();
            break;
        case 3:
            manager.saveToFile("students.txt");
            break;
        case 4:
            return 0;
        default:
            cout << "输入有误，请重新选择" << endl;
        }
    }

    return 0;
}

注意，上面的代码中假设学生信息以逗号分隔，并且每个学生信息占据一行。在实际使用中，我们应该根据实际情况修改代码以适应不同的数据格式。