valid and invalid enum declarations

valid enum declarations:
enum Beer
   {
               KF, RC;
    }

enum Beer
   {
                KF, RC;
            int price;  //valid
   }

 enum Month
      {
         Jan,Feb,JAN;  //valid, due to case sensitive jan!=JAN
  }

 class Ordinary
{
        public enum Dir{North,South,East}
}

in-valid enum declarations:
    enum Beer
   {
           KF, RC //invalid ; missing
         int price;
   }
   enum Beer
   {
          int price; //invalid  1st  statment should be enum  constants.
          KF, RC;
   }
  
enum Month
{
    Jan,Feb,Jan;  //invalid,error:Jan already defined
}