Switch expression (modern C#) - Mini Project: Build & Apply

Using Switch Expression in C#

📖 Scenario: You are building a simple program that assigns a description to a day of the week. This helps users understand what kind of day it is.

🎯 Goal: Create a program that uses a modern C# switch expression to convert a day name into a short description.

📋 What You'll Learn

Create a string variable called day with a day name.

Create a switch expression called description that matches day to a description.

Use the switch expression to assign descriptions for Monday, Friday, and Sunday.

Print the description to the console.

💡 Why This Matters

🌍 Real World

Switch expressions help write clear and concise code for decision making, such as mapping inputs to outputs in apps.

💼 Career

Understanding switch expressions is useful for C# developers to write modern, readable, and maintainable code.

1

Create the day variable

Create a string variable called day and set it to the value "Monday".

C Sharp (C#)

// Create a string variable called day and set it to "Monday"
// Your code here

Need a hint?

Use string day = "Monday"; to create the variable.

2

Create the description switch expression

Create a string variable called description and use a switch expression on day to assign:
- "Start of work week" for "Monday"
- "Almost weekend" for "Friday"
- "Rest day" for "Sunday"
Use _ as the default case with "Regular day".

C Sharp (C#)

string day = "Monday";
// Create a switch expression called description based on day
// Your code here

Need a hint?

Use the syntax: string description = day switch { "Monday" => "Start of work week", ... };

3

Change day to "Friday"

Change the value of the day variable to "Friday".

C Sharp (C#)

string day = "Monday";
string description = day switch
{
    "Monday" => "Start of work week",
    "Friday" => "Almost weekend",
    "Sunday" => "Rest day",
    _ => "Regular day"
};
// Change day to "Friday"
// Your code here

Need a hint?

Just replace the value inside the quotes: string day = "Friday";

4

Print the description

Write a Console.WriteLine statement to print the value of description.

C Sharp (C#)

string day = "Friday";
string description = day switch
{
    "Monday" => "Start of work week",
    "Friday" => "Almost weekend",
    "Sunday" => "Rest day",
    _ => "Regular day"
};
// Print the description
// Your code here

Need a hint?

Use Console.WriteLine(description); to show the result.