我试图从一个代表学生的文件中加载输入。每个学生都有一个名字和分数列表，如下所示：

Name John Wayne
Scores 100 90 80 100 0

Name Bob Dwight
Scores 0 0 10 100

Name Dummy Student
Scores 0 0

我是通过这样的类结构来阅读这篇文章的。一个教室对象保存了所有学生的列表。

class Student
{
    string first_name;
    string last_name;
    vector<int> quizzes;

public:
    void read(istream & in){
        string line;

        // Name initialization
        getline(in, line);
        stringstream namereader(line);

        string word;
        namereader >> word; // Go past "Name"
        namereader >> word;
        first_name = word; // Second word in a line is firstname
        namereader >> word;
        last_name = word; // Third word in a line is lastname
        
        // Quizzes
        getline(in, line); // line after name contains quiz scores
        stringstream quizreader(line);
        quizreader >> word; // Go past "Quiz"
        int quizgrade;
        while(quizreader >> quizgrade){ // Read quiz scores and insert
            quizzes.insert(quizzes.end(), quizgrade);
        }

        // Putting quizreader.str(""), quizreader.clear() does not work

        //Empty Line between each student
        getline(in, line);
    }
    
    void print(ostream & out) const{
        out << "Name    " << first_name << " " << last_name << endl;
        out << "QZ Ave: " <<  endl;

        for (int i : quizzes){
            cout << i << " ";
        }
        cout << endl;
    }

    friend ostream & operator <<(ostream &out, const Student & student){
        student.print(out);
        return out;
    }

    friend istream & operator >>(istream &in, Student & student){
        student.read(in);
        return in;
    }
};

教室：

class Classroom{
    vector<Student> students;
public:
    void print(ostream & out) const{
        for (Student s : students){
            out << s << endl;
        }
    }

    void read(istream & in){
        Student s;
        while (in >> s){
            students.insert(students.end(), s);
        }
    }

    friend ostream & operator <<(ostream &out, const Classroom & cl){
        cl.print(out);
        return out;
    }

    friend istream & operator >>(istream &in, Classroom & cl){
        cl.read(in);
        return in;
    }
};

主要功能：

int main(){
    ifstream in("classroom.txt");
    Classroom cl;
    in >> cl;
    cout << cl;
    return 0;
}

当我试图打印出来时，我注意到我的stringstream在Classroom：：read中的for循环调用之间 * 没有 * 重置。
这意味着main函数的输出为：

John Wayne
Scores 100 90 80 100 0

Bob Dwight
Scores 100 90 80 100 0 0 0 10 100

Dummy Student
Scores 100 90 80 100 0 0 0 10 100 0 0

我试过用.clear（）和.str（“”）清除所有的字符串流。无论我把它们放在read（）的哪个位置，以什么顺序，它们都不起作用。让我感到奇怪的是，quizreader保留了所有前面的数字，但是namereader继续下去，并按照预期的那样取下一个名称。这是打开多个字符串流的问题吗？不正确的初始化？
我假设所有的输入都是正确的类型，这些问题我将在以后修复。我已经阅读了几乎每一个帖子，我可以找到这个网站上与这个主题有关，但我似乎找不到一个工作的解决方案。