C# program to demonstrate example of nested switch statement

Nested switch statement

switch statement in C# permits checking a variable/esteem with a rundown of qualities (cases) and executing the square connected with that case.

At the point when we use switch statement inside another switch statement (a case statement(s)) for example switch statement inside another switch statement, we can say it is a case of a nested switch statement.

Syntax

//outer switch
    switch(variable/expression)
    {
        case <case_value1>:
            statement(s);
            //inner switch
            switch(variable/expression)
            {
                case <case_value1>:
                    statement(s);
                    break;
                case <case_value2>:
                    statement(s);
                    break;
                default:
                    statement(s);
                    break;
            }
        break;
        case <case_value2>:
            statement(s);
            break;
        default:
            statement(s);
            break;
    }

C# code for nested switch statement

// C# program to demonstrate example of nested switch statement
using System;
using System.IO;
using System.Text;

namespace JustTechReview
{
    class Test
    {
        // Main Method 
        static void Main(string[] args)
        {
            int number;

            //input a number
            Console.Write("Enter a number (1-3): ");
            number = Convert.ToInt32(Console.ReadLine());

            //outer switch statement
            switch (number)
            {
                case 1:
                    //using another case 
                    //it will input R,G or B and print the color
                    char color;
                    Console.Write("Enter color value (R/G/B): ");
                    color = Console.ReadLine()[0];
                    //validating it using switch case
                    //inner switch
                    switch (color)
                    {
                        case 'R':
                        case 'r':
                            Console.WriteLine("You've choesn \"Red\" color");
                            break;
                        case 'G':
                        case 'g':
                            Console.WriteLine("You've choesn \"Green\" color");
                            break;
                        case 'B':
                        case 'b':
                            Console.WriteLine("You've choesn \"Blue\" color");
                            break;
                        default:
                            Console.WriteLine("Invalid color code");
                            break;
                    }
                    break;

                case 2:
                    Console.WriteLine("Input is 2");
                    break;

                case 3:
                    Console.WriteLine("Input is 3");
                    break;
                default:
                    Console.WriteLine("Invalid number");
                    break;
            }


            //hit ENTER to exit the program
            Console.ReadLine();
        }
    }
}

Here, we have 3 cases:

(Case 1) Using another switch statement, that will give the shading name dependent on the client input (shading code – model “R/r” for “Red”, “G/g” for “Green”, …)

(Case 2) and Case 3) will print a straightforward message.

Output

First run:
Enter a number (1-3): 1
Enter color value (R/G/B): B
You've choesn "Blue" color

Second run:
Enter a number (1-3): 1
Enter color value (R/G/B): r
You've choesn "Red" color

Third run:
Enter a number (1-3): 1
Enter color value (R/G/B): x
Invalid color code

Fourth run:
Enter a number (1-3): 3
Input is 3