switch-case Statement :

The structure switch-case chooses which part of the programming code to execute based on the calculated value of a certain expression.

Syntax :

switch (expression)
{
case 1:
statements;
break;

case 2:
statements;
break;

default:
statements;
break;
}

Example :

/* Description: simple switch-case program */ using System; namespace DemoProgramming { class Program { static void Main(string[] args) { int number=2; switch (number) { case 1: Console.WriteLine("The 'int number' value is 1"); break; case 2: Console.WriteLine("The 'int number' value is 2"); break; default: Console.WriteLine("The 'int number' value is Unknown!"); break; } Console.ReadKey(); } } }

Output :

Rules for Expressions in Switch :

The switch statement is a clear way to implement selection among many options (namely, a choice among a few alternative ways for executing the code). It requires a selector, which is calculated to a certain value. The selector type could be an integer, char, string or enum. If we want to use for example an array or a float as a selector, it will not work. For noninteger data types, we should use a series of if statements.