how do I use an enum value on a switch statement in C

Question

I would like to use an enum value for a switch statement  Is it possible to use the enum values enclosed in      as choices for the switch     I know that switch   needs an integer value in order to direct the flow of programming to the appropriate case number  If this is the case  do I just make a variable for each constant in the enum statement  I also want the user to be able to pick the choice and pass that choice to the switch   statement    For example   cout  lt  lt   1 - Easy     cout  lt  lt   2 - Medium     cout  lt  lt   3 - Hard      enum myChoice   EASY   1  MEDIUM   2  HARD   3     cin  gt  gt        switch         case 1 EASY       can I just type case EASY       cout  lt  lt   You picked easy        break   case 2 MEDIUM       cout  lt  lt   You picked medium        break   case 3 HARD            same thing as case 2 except on hard    default      return 0

User · Answer

You can use an enumerated value just like an integer   myChoice c        switch  c     case EASY      DoStuff        break  case MEDIUM

User · Answer

Some things to note     You should always declare your enum inside a namespace as enums are not proper namespaces and you will be tempted to use them like one     Always have a break at the end of each switch clause execution will continue downwards to the end otherwise   Always include the default  case in your switch   Use variables of enum type to hold enum values for clarity   see here for a discussion of the correct use of enums in C     This is what you want to do   namespace choices       enum myChoice                 EASY   1           MEDIUM   2           HARD   3             int main int c  char   argv        choices  myChoice enumVar      cin  gt  gt  enumVar      switch  enumVar                case choices  EASY                           do stuff             break                    case choices  MEDIUM                           do stuff             break                     default                           is likely to be an error

User · Answer

include  lt iostream gt  using namespace std   int main          enum level  EASY   1  NORMAL  HARD           Present menu     int choice      cout  lt  lt   Choose your level  n n       cout  lt  lt   1 - Easy  n       cout  lt  lt   2 - Normal  n       cout  lt  lt   3 - Hard  n n       cout  lt  lt   Choice -- gt         cin  gt  gt  choice      cout  lt  lt  endl       switch  choice        case EASY          cout  lt  lt   You chose Easy  n           break      case NORMAL          cout  lt  lt   You chose Normal  n           break      case HARD          cout  lt  lt   You chose Hard  n           break      default          cout  lt  lt   Invalid choice  n              return 0

User · Answer

Note  I do know that this doesn t answer this specific question  But it is a question that people come to via a search engine  So i m posting this here believing it will help those users    You should keep in mind that if you are accessing class-wide enum from another function even if it is a friend  you need to provide values with a class name   class PlayingCard   private    enum Suit   CLUBS  DIAMONDS  HEARTS  SPADES      int rank    Suit suit    friend std  ostream amp  operator lt  lt   std  ostream amp  os  const PlayingCard  amp pc       std  ostream amp  operator lt  lt   std  ostream amp  os  const PlayingCard  amp pc         output the rank        switch pc suit          case PlayingCard  HEARTS        os  lt  lt   h         break      case PlayingCard  DIAMONDS        os  lt  lt   d         break      case PlayingCard  CLUBS        os  lt  lt   c         break      case PlayingCard  SPADES        os  lt  lt   s         break        return os      Note how it is PlayingCard  HEARTS and not just HEARTS

User · Answer

i had a similar issue using enum with switch cases later i resolved it on my own    below is the corrected code  perhaps this might help          Menu Chooser Programe using enum       include lt iostream gt       using namespace std       int main                  enum level Novice 1  Easy  Medium  Hard           level diffLevel Novice          int i          cout lt  lt   nenter a level             cin gt  gt i          switch i                    case Novice  cout lt  lt   nyou picked Novice n   break          case Easy  cout lt  lt   nyou picked Easy n   break          case Medium  cout lt  lt   nyou picked Medium n   break          case Hard  cout lt  lt   nyou picked Hard n   break          default  cout lt  lt   nwrong input    n   break                    return 0

User · Answer

You re on the right track  You may read the user input into an integer and switch on that   enum Choice     EASY   1     MEDIUM   2     HARD   3     int i   -1          lt present the user with a menu gt      cin  gt  gt  i   switch i      case EASY      cout  lt  lt   Easy n       break    case MEDIUM      cout  lt  lt   Medium n       break    case HARD      cout  lt  lt   Hard n       break    default      cout  lt  lt   Invalid Selection n       break

User · Answer

You can use a std  map to map the input to your enum    include  lt iostream gt   include  lt string gt   include  lt map gt  using namespace std   enum level  easy  medium  hard   map lt string  level gt  levels   void register levels         levels  easy       easy      levels  medium     medium      levels  hard       hard     int main         register levels        string input      cin  gt  gt  input      switch  levels input              case easy          cout  lt  lt   easy    break      case medium          cout  lt  lt   medium    break      case hard          cout  lt  lt   hard    break

User · Answer

The user s input will always be given to you in the form of a string of characters    if you want to convert the user s input from a string to an integer  you ll need to supply the code to do that   If the user types in a number  e g   1    you can pass the string to atoi   to get the integer corresponding to the string   If the user types in an english string  e g   EASY   then you ll need to check for that string  e g  with strcmp    and assign the appropriate integer value to your variable based on which check matches   Once you have an integer value that was derived from the user s input string  you can pass it into the switch   statement as usual

[c++] how do I use an enum value on a switch statement in C++

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