Перечисляемый тип enum

#include <iostream>
#include <string>
#include <fstream>

//перечисляемый тип enum
enum PCState
{
    //это по сути просто константы
    ON,
    OFF,
    SLEEP
};

class StateClass
{

public:
    //сеттер, принимает константу енума PCState
    void SetState(PCState State)
    {
        this->State = State;
    }
    //геттер
    PCState GetState()
    {
        return State;
    }

private:
    PCState State = PCState::OFF;

};

int main(int argc, char *argv[])
{
    setlocale(LC_ALL, "Rus");
    srand(time(NULL));

    StateClass st;
    st.SetState(PCState::SLEEP);

    switch(st.GetState())
    {
        case PCState::ON:
            std::cout << "ON" << std::endl;
            break;
        case PCState::OFF:
            std::cout << "OFF" << std::endl;
            break;
        case PCState::SLEEP:
            std::cout << "SLEEP" << std::endl;
            break;
    }


    return 0;
}