What does it mean to use the keyword enum? when using this in a class (OOP)?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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What does it mean to use the keyword enum? when using this in a class (OOP)?

 

For example (also not a good example, but a reference to what I mean):

#include "box.h"

using namespace std;

enum class Box{

         Member,

        Admin,

        Employee

};

#include "box.h"

#include <iostream>

using namespace std;

int main(){

          if (answer == 1)

                    string admin_name Box::Admin;

                   court << "You are an " << admin_name << endl;

}

 

Can you explain to me in this case what enum is used for in this case? In this part, I cannot understand the usage in this case.

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