7. Enum

In C#, an enum, or enumeration, is a distinct value type that defines a set of named integral constants. Enums provide a way to create named values for a set of related items, making code more readable and self-documenting. Enums are often used to represent a set of predefined values or options.

using System;
 
namespace EnumExample
{
    // Define an enum named Day
    public enum Day
    {
        Sunday,    // 0
        Monday,    // 1
        Tuesday,   // 2
        Wednesday, // 3
        Thursday,  // 4
        Friday,    // 5
        Saturday   // 6
    }
 
    class Program
    {
        static void Main(string[] args)
        {
            // Assign an enum value
            Day today = Day.Wednesday;
 
            // Output the enum value
            Console.WriteLine("Today is: " + today); // Outputs: Today is: Wednesday
 
            // Use enums in a switch statement
            switch (today)
            {
                case Day.Monday:
                    Console.WriteLine("Start of the work week!");
                    break;
                case Day.Wednesday:
                    Console.WriteLine("Midweek day!");
                    break;
                case Day.Friday:
                    Console.WriteLine("Almost the weekend!");
                    break;
                case Day.Saturday:
                case Day.Sunday:
                    Console.WriteLine("It's the weekend!");
                    break;
                default:
                    Console.WriteLine("Just another day.");
                    break;
            }
        }
    }
}