程序代码：

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

class  Gradebook
{
   public:
      // Gradebook(string name)
      // {   
          
           //setcoursename(name);

       //}
       void setcoursename(string name)
       {
           coursename=name;     
       }
       string  getcoursename()
       {
           return  coursename;
       }
       void displaymessage()
       {
           cout<<"Welcom to the grade book for \n"<<getcoursename() <<"!"<<endl; 

       }

   private:
       string coursename;

};这是一个简单的类

程序代码：

#include"Gradebook.h"
#include<iostream>
#include<string>
int main()
{
    string nameofcourse;
    Gradebook myGradebook;
    cout<<"请输入这个课程的名字："<<endl;
     getline(cin, nameofcourse);

     myGradebook.setcoursename(nameofcourse);
     cout<<endl;
     myGradebook.displaymessage();
         cout<<endl;
     return 0;
}