C++ Tutorial/Data Types/enum

A Demonstration of Enumerated Constants

<source lang="cpp">#include <iostream> int main() {

  enum Days { Sunday, Monday, Tuesday,Wednesday, Thursday, Friday, Saturday };
  Days today;
  today = Monday;
  if (today == Sunday || today == Saturday)
     std::cout << " love the weekends!\n";
  else
     std::cout << "\nBack to work.\n";
  return 0;

}</source>

An enumeration static_cast

<source lang="cpp">#include <iostream> using std::cout; enum Language { English, French, German, Italian, Spanish }; int main() {

 Language tongue = German;
 tongue = static_cast<Language>(tongue + 1);
 cout << "\n Current language is now " << tongue
      << std::endl;

 return 0;

}</source>

Current language is now 3

An enumeration variable

<source lang="cpp">#include <iostream> using std::cout; enum Language { English, French, German, Italian, Spanish }; int main() {

 Language tongue = German;
 cout << "\n Current language is " << tongue;
 return 0;

}</source>

Current language is 2

Compare enum elements

<source lang="cpp">#include<iostream.h> enum color{

   RED=1,
 GREEN=6,
 BLUE=9

}; int main() {

  enum color v1=RED,v2;
  cout<<"RED="<<RED<<endl;
  cout<<"GREEN="<<GREEN<<endl;
  cout<<"BLUE="<<BLUE<<endl;
  cout<<"v1="<<v1<<endl;
  v2=GREEN;
  cout<<"(v1<v2)="<<(v1<v2)<<endl;

}</source>

RED=1
GREEN=6
BLUE=9
v1=1
(v1<v2)=1

Define and output an enumeration

<source lang="cpp">#include <iostream> using std::cout; enum Language { English, French, German, Italian, Spanish }; int main() {

 cout << "\nPossible languages are:\n"
      << English << ". English\n"
      << French  << ". French\n"
      << German  << ". German\n"
      << Italian << ". Italian\n"
      << Spanish << ". Spanish\n";
 return 0;

}</source>

Possible languages are:
0. English
1. French
2. German
3. Italian
4. Spanish

Demonstrate an enumeration.

<source lang="cpp">#include <iostream> using namespace std;

enum Letter { A, B, C, D, E };

char name[][20] = {

 "Automobile", 
 "Bank", 
 "Cat", 
 "Day", 
 "eagle" 

};

int main() {

 Letter how; 

 how = A; 
 cout << name[how] << "\n"; 

 how = C; 
 cout << name[how] << "\n"; 

 how = D; 
 cout << name[how] << "\n"; 

 return 0; 

}</source>

Automobile
Cat
Day

Return enum from a function

<source lang="cpp">#include <iostream>

enum ERR_CODE { SUCCESS, ERROR };

ERR_CODE f(int, int&, int&);

int main()
{
    int number = 2, squared, cubed;
    ERR_CODE result;

    result = f(number, squared, cubed);

    if (result == SUCCESS)
    {
        ;
    }
    else
        std::cout << "Error encountered!!\n";
    return 0;
}

ERR_CODE f(int n, int &rSquared, int &rCubed)
{
        return ERROR;   // simple error code
}</source>

Error encountered!!

Using consts and enums in Arrays

<source lang="cpp">#include <iostream> using namespace std; int main() {

  enum WeekDays { Sun, Mon, Tue,Wed, Thu, Fri, Sat, DaysInWeek };
  int ArrayWeek[DaysInWeek] = { 10, 20, 30, 40, 50, 60, 70 };
  cout << "The value at Tuesday is: " << ArrayWeek[Tue];
return 0;

}</source>