Day 3 of 30-Day .NET Challenge: Switch Constructs

Introduction

The switch statements are available for creating branching logic, each offering distinct advantages based on readability and maintenance.

Learning Objectives

• Utilize the switch-case construct to compare a variable or expression with multiple potential outcomes.

Prerequisites for Developers

• Utilizing the if-else construct to incorporate branching logic.

• Handling variables, employing string interpolation, and displaying output.

Getting Started

What is a switch statement?

The switch statement selects and executes a specific section of code from a list of options known as switch sections. This selection is made by matching the switch expression with predefined patterns in the switch sections.

Basic Example

switch (fruit)
{
    case "apple":
        Console.WriteLine($"App will display information for apple.");
        break;

    case "banana":
        Console.WriteLine($"App will display information for banana.");
        break;

    case "cherry":
        Console.WriteLine($"App will display information for cherry.");
        break;
}

Basic Switch Example

To begin, create a static class file called “Switch.cs” within the console application. Insert the provided code snippet into this file.

static int employeeLevel = 200;
static string employeeName = "John Smith";

/// <summary>
/// Outputs
/// John Smith, Senior Associate
/// </summary>
public static void SwitchExample()
{
    string title = "";

    switch (employeeLevel)
    {
        case 100:
            title = "Junior Associate";
            break;
        case 200:
            title = "Senior Associate";
            break;
        case 300:
            title = "Manager";
            break;
        case 400:
            title = "Senior Manager";
            break;
        default:
            title = "Associate";
            break;
    }

    Console.WriteLine($"{employeeName}, {title}");
}

Execute the code from the main method as follows

#region Day 3 - Switch Constructs

Switch.SwitchExample();

#endregion

Console Output

// Console Output
John Smith, Senior Associate

Change Switch Label

Add another method into the same static class as shown below

static int employeeLevel = 200;
static string employeeName = "John Smith";

public static void SwitchExample()
{
    string title = "";

    switch (employeeLevel)
    {
        case 100:
            title = "Junior Associate";
            break;
        case 200:
            title = "Senior Associate";
            break;
        case 300:
            title = "Manager";
            break;
        case 400:
            title = "Senior Manager";
            break;
        default:
            title = "Associate";
            break;
    }

    Console.WriteLine($"{employeeName}, {title}");
}

/// <summary>
/// John Smith, Associate
/// </summary>
public static void ChangeSwitchLabelExample()
{
    employeeLevel = 201;
    SwitchExample();
}

Execute the code from the main method as follows

#region Day 3 - Switch Constructs

Switch.ChangeSwitchLabelExample();

#endregion

Console Output

// Console Output
John Smith, Associate

Multiple Switch Labels

Add another method into the same static class as shown below

    /// <summary>
    /// Outputs
    /// John Smith, Senior Associate
    /// </summary>
    public static void MultipleSwitchLabelExample()
    {
        int employeeLevel = 100;
        string employeeName = "John Smith";

        string title = "";

        switch (employeeLevel)
        {
            case 100:
            case 200:
                title = "Senior Associate";
                break;
            case 300:
                title = "Manager";
                break;
            case 400:
                title = "Senior Manager";
                break;
            default:
                title = "Associate";
                break;
        }

        Console.WriteLine($"{employeeName}, {title}");
    }

Execute the code from the main method as follows

    #region Day 3 - Switch Constructs

    Switch.MultipleSwitchLabelExample();

    #endregion

Console Output

    // Console Output
    John Smith, Senior Associate

Complete Code on GitHub

GitHub — ssukhpinder/30DayChallenge.Net

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