Enum Keyword:

The Enum also called ad Enumeration. This is the efficient way to declare Integral constants

The enum key word is used to declare Enumeration, a distinct type that consists of a set of named constants called the enumerator list in C#.

Usually it is best to define an enum directly within a namespace so that all classes in the namespace can access it with equal convenience. However, an enum can also be nested within a class or struct.

Every Enumeration has integral type, which can be either int, long, short or byte. The default underlying type of the enumeration element is Int and default value is 0.

 The Value of enum is assigned either implicitly or explicitly.

 If the declaration of enum has initialization with any constant value, that value is implicitly converted into enum type. If the declaration doesn’t have any initialization, it takes a value implicitly as follows

è     if it is the first member in the enum list, then it is initialized with zero ‘0’

è     if it is not first member in the enum list, then its value is obtained by incrementing it previous value.

Syntax:

Enum <Enumname>

{

Member1 = value1;

Member2 = value2

..

}

Ex:

     enum Days {Sat, Sun, Mon, Tue, Wed, Thu, Fri};

Example program:

using System;

using System.Collections.Generic;

using System.Text;

namespace Enum1

{

    public enum Days { Mon, tue, wed, thur=10, fri, sat, sun };

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Monday {0} ", (int)Days.Mon);

            Console.WriteLine("Tuesday {0} ",(int)Days.tue);

            Console.WriteLine("Wedness Day {0}",(int) Days.wed);

            Console.WriteLine("Thursday {0} ", (int)Days.thur);

            Console.WriteLine("Friday {0} ", (int)Days.fri);

            Console.WriteLine("saturday {0}  ",(int) Days.sat);

            Console.ReadKey();

        }

    }

}

Output: