How to specify a number in an enum

Question

Sorry if the question may be very stupid: I have an enum and the name contained in the enum must be a number:

enum class EE
{
    ZERO,
    ONE,
    TWO,
    // ...
}

enum class EE2
{
    _0,
    _1,
    _2,
    // and so on ...
};

If i remember well the undercorse in front of names must be reserved to implementation. But which is the preferred way to sepcify a number inside an enum?

Let's have a more concrete example: I can write for example:

enum JoysticButton
{
    BUTTON_1,
    BUTTON_2,
    // AND SO ON
};

But to use the enum I have to write:

if ( k == JoysticButton::BUTTON_1 )

And this is very much verbose. Or.

enum JoysticButton
{
    _1,
    _2,
    // AND SO ON
};

if ( k == JoysticButton::_1 )

But the second alternative is less clear

Answer 1

But which is the preferred way to sepcify a number inside an enum?

The prefer way is to be specific, and name the enum and it's values as clearly as possible. It all depends what the enum represents.

For example, if the number represents a version, then something like this (btw EE is an awful generic name) :

enum class EE
{
    v_1,
    v_1_1,
    v_2,
    v_3,
    // ...
};