Relational patterns in C Sharp (C#) - Mini Project: Build & Apply

Relational patterns

📖 Scenario: You are building a simple program to check the age of a person and categorize them as a child, teenager, adult, or senior.

🎯 Goal: Create a program that uses relational patterns in a switch expression to print the correct age category based on the person's age.

📋 What You'll Learn

Create an integer variable age with the exact value 25.

Create a string variable category to hold the age group.

Use a switch expression with relational patterns to assign the correct category:

< 13 is "Child"

< 20 is "Teenager"

< 65 is "Adult"

Anything else is "Senior"

Print the category variable.

💡 Why This Matters

🌍 Real World

Age categories are used in many apps like games, websites, and services to customize content or permissions.

💼 Career

Understanding relational patterns helps you write clear and concise code for decision making in professional C# development.

1

Create the age variable

Create an integer variable called age and set it to 25.

C Sharp (C#)

# Create an integer variable called age and set it to 25
# Your code here

Need a hint?

Use int age = 25; to create the variable.

2

Create the category variable

Create a string variable called category to hold the age group. Initialize it with an empty string "".

C Sharp (C#)

int age = 25;
// Create a string variable called category and set it to an empty string
# Your code here

Need a hint?

Use string category = ""; to create the variable.

3

Use switch expression with relational patterns

Use a switch expression on the variable age with relational patterns to assign the correct string to category. Use these patterns:
< 13 returns "Child"
< 20 returns "Teenager"
< 65 returns "Adult"
Anything else returns "Senior".

C Sharp (C#)

int age = 25;
string category = "";
// Use a switch expression with relational patterns to assign category
# Your code here

Need a hint?

Use category = age switch { < 13 => "Child", < 20 => "Teenager", < 65 => "Adult", _ => "Senior" };

4

Print the category

Write a Console.WriteLine statement to print the value of the variable category.

C Sharp (C#)

int age = 25;
string category = age switch
{
     "Child",
     "Teenager",
     "Adult",
    _ => "Senior"
};
// Print the category variable
# Your code here

Need a hint?

Use Console.WriteLine(category); to print the result.