一个关于string的错误

CourseClass.h

#ifndef COURSE_H
#define COURSE_H

#include <vector>
#include <string>
using namespace std;
class CCourse
{
public:
    CCourse(const string& courseName);
    string getCourseName();
    void addStudent(const string &student);
    string getStudent();
    int getNumberOfStudents();

private:
    string m_scourseName;
    vector<string> v_sstudent;
    int m_inumberOfStudents;
};

#endif


CourseClass.cpp


#include "CourseClass.h"
#include <iostream>
using namespace std;
CCourse::CCourse(const string& courseName)  // 构造函数与类同名
{
    m_inumberOfStudents = 0;
    this->m_scourseName = courseName;
}

string CCourse::getCourseName()
{
    return m_scourseName;
}

void CCourse::addStudent(const string &student)
{
    v_sstudent.push_back(student);
    m_inumberOfStudents++;
}
string CCourse::getStudent()
{
    return *v_sstudent.begin();    // v_sstudent.begin()返回的是地址
}

int CCourse::getNumberOfStudents()
{
    return m_inumberOfStudents;
}

void main()
{

    CCourse course("Database");
    string stuName;
    bool flag = 1;
    while(flag)
    {
        cout<<"请输入添加学生的姓名:"<<endl;
        cin>>stuName;                             // 怎么还在输入前加类型
        course.addStudent(stuName);
        cout<<"继续加入学生? 是(1) 否(0)"<<endl;
        cin>>flag;
    }
    cout<<"本课堂的学生为"<<course.getCourseName()<<endl;
    cout<<"本课堂共有学生的人数为"<<course.getNumberOfStudents()<<endl;
    cout<<"检测通过"<<endl;
}