C ++ CIN cin überspringt zufällig

Ich habe dieses Programm, aber cin überspringt es nach dem Zufallsprinzip. Ich meine, manchmal ist es das und manchmal nicht. Irgendwelche Ideen, wie man das behebt?

    int main(){ 


        /** get course name, number of students, and assignment name **/
        string course_name;
        int numb_students;
        string assignment_name;
        Assignment* assignment;

        cout << "Enter the name of the course" << endl;
        cin >> course_name;

        cout << "Enter the number of students" << endl;
        cin >> numb_students;   

        cout << "Enter the name of the assignment" << endl;
        cin >> assignment_name;

        assignment = new Assignment(assignment_name);

        /** iterate asking for student name and score **/
        int i = 0;
        string student_name;
        double student_score = 0.0;
        while( i < numb_students ){

            cout << "Enter the name for student #" << i << endl;
            cin >> student_name;
            cout << "Enter the score for student #" << i << endl;
            cin >> student_score;
            assignment->addScore( Student( student_name, student_score ));
            i++;
        }
}

OK Ich habe es herausgefunden. Für alle, die es wissen möchten, hier der aktualisierte Code:

int main(){ 

    /** get course name, number of students, and assignment name **/
    string course_name;
    int numb_students;
    string assignment_name;

    cout << "Enter the name of the course" << endl;
    getline(cin, course_name);

    cout << "Enter the number of students" << endl;
    string temp;
    getline(cin, temp);
    numb_students = atoi(temp.c_str());

    cout << "Enter the name of the assignment" << endl;
    getline(cin, assignment_name);

    Assignment assignment(assignment_name);

    /** iterate asking for student name and score **/
    int i = 0;
    string student_name;
    double student_score = 0.0;
    while( i < numb_students ){

        cout << "Enter the name for student #" << i+1 << endl;
        getline(cin, student_name);     
        cout << "Enter the score for student #" << i+1 << endl;
        getline(cin, temp);
        student_score = atof(temp.c_str());
        assignment.addScore( Student( student_name, student_score ));
        i++;
    }

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