enum : Character & String

enum characters : Character {

    case a = "A" // a, raw value : A

    case b = "B" // b, raw value : B

    case c = "C" // c, raw value : C

    case d

    // error : Enum cases require explicit raw values when the raw type is not expressible by integer or string literal

}

 

enum strings : String {

    case a = "A" // a, raw value : A

    case b // b, raw value : b

    case c = "C" // c, raw value : C

}