主文件

#include <iostream>
#include "GradeBook.h"

using namespace std;

int main()
{
    GradeBook myGradeBook; // 创建一个对象
    cout << "请输入课程名称:" ;
    string courseName;
    cin >> courseName;

    cout << "请输入学生人数" ;
    int studentCount;
    cin >> studentCount;

    myGradeBook.resizeGrades(studentCount); // 调用动态分配数组

    myGradeBook.setStudentCount(studentCount);
    //cout <<"The number of the student is:"<< myGradeBook.getStudentCount() << endl;

    myGradeBook.setCourseName(courseName); // 调用类里面的函数
    //cout <<"The name of this Grade Book is:"<< myGradeBook.getCourseName() << endl;

    myGradeBook.print();
    return 0;
}

GradeBook.cpp文件，完成其相应的功能。

#include "GradeBook.h"

using namespace std;

void GradeBook::setCourseName(string name)
{
    courseName = name;
}

void GradeBook::setStudentCount(int id)
{
    studentCount = id;
}

string GradeBook::getCourseName()
{
    return courseName;
}

int GradeBook::getStudentCount()
{
    return studentCount;
}

void GradeBook::displayMessage()
{
    cout << "Welcome to the GradeBook" << endl;
}

void GradeBook::resizeGrades(int newsize) // 调整成绩数组大小
{
    grade.resize(newsize); // 使用vector的resize方法
}

void GradeBook::print()
{
    cout << "The number of the student is:" << getStudentCount() << endl;
    cout << "The name of this Grade Book is:" << getCourseName() << endl;
}

GradeBook.h文件

#ifndef GRADEBOOK_H
#define GRADEBOOK_H

#include <iostream>
#include <vector>

using namespace std;

class GradeBook // GradeBook is the class namespace
{
    public: // open to the users
        void print();
        void setCourseName(string name);
        void setStudentCount(int id);
        void resizeGrades(int newsize); // 调整成绩数组大小
        string getCourseName();
        int getStudentCount();
    private: // not open to the users
        string courseName; // string 字符串
        int studentCount;
        //double grade[];
        vector<int> grade; // 使用vector动态管理数组
};

#endif // gradebook