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Before Read Terms of use

C# switch statement



                                                           You have learned how to use a series of nested if statements to execute only one set of statements from several sets of statements. Nesting of if statements up to some levels (for example ,up to fourth r fifth level) helps to improve the readability of the program code; however, a more deeply nested series of if statements makes the program code difficult to read. The switch statement provides a better alternative in this situation. It allows you to select and execute a particular set of statements from a list of given sets of statements. The set of statements that is executed in the switch statement depends on the value of an expression

The syntax of the switch statement  is as follows: 


Switch(expression)

{

          case constant1:

          //statements1

          break

       case constant2:

                   //statements2

                break

             case constant3:

                   //statements3

                break

               .

               .

     case constantN:

       //statementsN

    break

   default:

    //statement

     break:

 

}


In the preceding syntax,


switch : Refer to the switch keyword that indicates a switch statement

expression: Refer to the expression that is checked in the switch statement. This expression must evaluated to a value of integral, string or Boolean type.

case: Refer to the case keyword that indicates a case statement, which consists of a case label and a labels for corresponding case statements

constants1,constants2,statements3,….statementsN: Refer to the sets of statements corresponding to the case statements. These sets of statements can be a single statement or multiple statements.

break: Refers to the break keyword that indicates a break statement.

default: Refers to the default keyword that indicates the default statement, which has the default label and a set of statements 



                                              In switch statements depending on the possible values of the expression  there can be as many case statements as you want. The case labels in the case statements have to be distinct and of the same data type as the expression. Unlike the case statements there can be only one default statement. In C# it is statements and default statement in any random order.



                                          The switch statement first evaluates the expression whose value is then checked against the case labels. When a match is found the corresponding case statement is executed. If no match is found the default statement is executed. After this, the statement following the switch statement is executed. If there is no default statement and there is no match with any of the case statements , then the statement following the switch statement is directly executed.



switch case example in console applicatoin as given below


using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;


namespace ConsoleApplicationDemo

{

    class Program

    {

        static void Main(string[] args)

        {


            int enteredNumber;

            Console.WriteLine("Enter the number rang of 0 to 5");

            enteredNumber = Convert.ToInt32(Console.ReadLine());

            switch(enteredNumber)

            {

                case 0:

                    Console.WriteLine("you entered ZERO");

                    break;

                case 1:

                    Console.WriteLine("you entered ONE");

                    break;

                case 2:

                    Console.WriteLine("you entered TWO");

                    break;

                case 3:

                    Console.WriteLine("you entered THREE");

                    break;

                case 4:

                    Console.WriteLine("you entered FOUR");

                    break;

                case 5:

                    Console.WriteLine("you entered FIVE");

                    break;

                default:

                    Console.WriteLine("Your number is grater then 5");

                    break;

            }                       

            Console.ReadKey();

        }

    }

}


Sundar  Neupane

Sundar Neupane

I like working on projects with a team that cares about creating beautiful and usable interfaces.

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