C++/Data Type/enum

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demonstrates enumerations

   
#include <iostream>   
  using namespace std;   
    
  const int jack = 11;
  const int queen = 12;   
  const int king = 13;   
  const int ace = 14;   
    
  enum Suit { clubs, diamonds, hearts, spades };   
  struct card{   
     int number;
     Suit suit; 
    };   
  int main()   
     {   
     card temp, chosen, prize; 
     int position;   
    
     card card1 = { 7, clubs };
     cout << "Card 1 is the seven of clubs\n";   
    
     card card2 = { jack, hearts };
     cout << "Card 2 is the jack of hearts\n";   
    
     card card3 = { ace, spades }; 
     cout << "Card 3 is the ace of spades\n";   
    
     prize = card3;              
    
     if(chosen.number == prize.number &&  chosen.suit == prize.suit)   
        cout << "That"s right!  You win!\n";   
     else   
        cout << "Sorry. You lose.\n";   
     return 0;   
  }


demonstrates enums, counts words in phrase

   
#include <iostream>   
  using namespace std;   
  #include <conio.h>
    
  enum itsaWord { NO, YES };
    
  int main(){   
     itsaWord isWord = NO;       
     char ch = "a";            
     int wordcount = 0;        
    
     cout << "Enter a phrase:\n";   
     do {   
        ch = getche();         
        if(ch==" " || ch=="\r"){   
           if( isWord == YES ){                 
              wordcount++;      
              isWord = NO;      
           }   
        }else if( isWord == NO ){
           isWord = YES;     
        }
     } while( ch != "\r" );     
     cout << wordcount;   
     return 0;   
  }


demonstrates enum types

   
#include <iostream>   
  using namespace std;   
  enum days_of_week { Sun, Mon, Tue, Wed, Thu, Fri, Sat };   
    
  int main() {   
     days_of_week day1, day2;  
                               
     day1 = Mon;               
     day2 = Thu;               
    
     int diff = day2 - day1;   
     cout << "Days between = " << diff << endl;   
    
     if(day1 < day2)           
        cout << "day1 comes before day2\n";   
     return 0;   
  }


Using bit fields.

  
#include <iostream>
#include <string.h>
using namespace std;
enum STATUS { FullTime, PartTime } ;
enum GRADLEVEL { UnderGrad, Grad } ;
enum HOUSING { Dorm, OffCampus };
enum FOODPLAN { OneMeal, AllMeals, WeekEnds, NoMeals };
class student
{
 public:
 student():
     myStatus(FullTime),
     myGradLevel(UnderGrad),
     myHousing(Dorm),
     myFoodPlan(NoMeals)
     {}
     ~student(){}
     STATUS GetStatus();
     void SetStatus(STATUS);
     unsigned GetPlan() { return myFoodPlan; }
 private:
    unsigned myStatus : 1;
    unsigned myGradLevel: 1;
    unsigned myHousing : 1;
    unsigned myFoodPlan : 2;
 };
 STATUS student::GetStatus()
 {
    if (myStatus)
       return FullTime;
    else
       return PartTime;
 }
 void student::SetStatus(STATUS theStatus)
 {
    myStatus = theStatus;
 }

 int main()
 {
    student Jim;
    if (Jim.GetStatus()== PartTime)
       cout << "Jim is part time" << endl;
    else
       cout << "Jim is full time" << endl;
    Jim.SetStatus(PartTime);
    if (Jim.GetStatus())
       cout << "Jim is part time" << endl;
    else
       cout << "Jim is full time" << endl;
    cout << "Jim is on the " ;
    char Plan[80];
    switch (Jim.GetPlan())
    {
       case  OneMeal: strcpy(Plan,"One meal"); break;
       case  AllMeals: strcpy(Plan,"All meals"); break;
       case WeekEnds: strcpy(Plan,"Weekend meals"); break;
       case NoMeals: strcpy(Plan,"No Meals");break;
       default : cout << "Something bad went wrong!\n"; break;
    }
    cout << Plan << " food plan." << endl;
  return 0;
}


Using consts and enums in Arrays

  
#include <iostream>
int main()
{
    enum WeekDays { Sun, Mon, Tue,Wed, Thu, Fri, Sat, DaysInWeek };
    int ArrayWeek[DaysInWeek] = { 10, 20, 30, 40, 50, 60, 70 };
   std::cout << "The value at Tuesday is: " << ArrayWeek[Tue];
   return 0;
}
Источник — «http://cppe.ru/index.php?title=C%2B%2B/Data_Type/enum&oldid=1626»