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Added exercises for LP1
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‎Instructions/01-create-a-greeting.md‎

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---
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lab:
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title: 'Create a personalized greeting'
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description: 'Write a C# program that uses Console.WriteLine(), Console.ReadLine(), and string interpolation to display a personalized greeting message.'
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level: 100
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duration: 15
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islab: true
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status: 'released'
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---
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# Create a personalized greeting
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In this exercise, you write a C# program that asks for the user's name and displays a personalized greeting. You practice using the `Console.WriteLine()` method to display output, the `Console.ReadLine()` method to collect user input, and string interpolation to format a custom message.
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This exercise takes approximately **15** minutes.
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## Open the online C# IDE
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You'll write and run your code using an online C# editor — no installation required.
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1. Open a browser and navigate to the C# editor at [https://microsoftlearning.github.io/c-sharp-minor](https://microsoftlearning.github.io/c-sharp-minor).
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2. You'll see two panels:
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- **Code Editor pane** (top): where you write your C# code.
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- **Output Console** (bottom): where output is displayed and where you can type input when the program asks for it.
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3. The editor may contain some default code. Select all of it and delete it so you're starting with a clean, empty file.
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## Set up your program
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Before writing any logic, you'll paste a set of guiding comments into the editor. These comments act as an outline for your program — each one marks where a specific piece of code belongs.
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1. Copy the following comments and paste them into the editor pane:
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```csharp
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// Display a welcome message
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// Ask for the user's name
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// Display a personalized greeting
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```
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Remember, comments are ignored by C# when the program runs. They're just there to help you organize your code.
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## Display a welcome message
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The first thing your program should do is greet the user when it starts. You'll use the `Console.WriteLine()` method to display a message on the screen.
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1. In the editor pane, add the following line beneath the `// Display a welcome message` comment:
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```csharp
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Console.WriteLine("Welcome to the greeting program!");
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```
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1. Select the ▶️ **Run** button to run the code.
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1. Check the output console. You should see:
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```output
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Welcome to the greeting program!
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```
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> **Note**: If nothing appears, make sure the code is typed exactly as shown, including the quotes, parentheses, and semicolon.
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1. Select the **Clear console** button to clear the output before you continue.
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## Ask for the user's name
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Now you'll add code that pauses the program and asks for the user's name. You'll use `Console.Write()` to display a prompt without moving to a new line, and `Console.ReadLine()` to wait for the user to type a response.
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1. Beneath the `// Ask for the user's name` comment, add the following lines:
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```csharp
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Console.Write("What is your name? ");
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string name = Console.ReadLine();
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```
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The first line displays the prompt `What is your name? ` in the console. The second line waits for the user to type a response and stores whatever they type into a variable called `name`.
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1. Run the program again by selecting ▶️ **Run**.
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1. When `What is your name? ` appears in the output console, click on the console and type your name, then press **Enter**.
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1. The program finishes after you enter your name — but it doesn't say anything yet. You'll fix that in the next step.
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1. Select **Clear console** before you continue.
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## Display a personalized greeting
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Now you'll use the `name` variable to build a personalized message. You'll do this with **string interpolation** — a technique that lets you embed variable values directly inside a string by prefixing the string with `$` and wrapping variable names in curly braces `{}`.
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1. Beneath the `// Display a personalized greeting` comment, add the following line:
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```csharp
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Console.WriteLine($"Hello, {name}! It's great to meet you.");
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```
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1. Run the program, enter your name when prompted, and press **Enter**.
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1. You should see output similar to:
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```output
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Welcome to the greeting program!
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What is your name? Alex
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Hello, Alex! It's great to meet you.
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```
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1. Your complete program should now look like this:
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```csharp
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// Display a welcome message
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Console.WriteLine("Welcome to the greeting program!");
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// Ask for the user's name
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Console.Write("What is your name? ");
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string name = Console.ReadLine();
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// Display a personalized greeting
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Console.WriteLine($"Hello, {name}! It's great to meet you.");
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```
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1. Run the program one more time and confirm the output matches what you entered. For example:
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```output
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Welcome to the greeting program!
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What is your name? Alex
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Hello, Alex! It's great to meet you.
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```
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## Code with AI
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Using an AI assistant (like Copilot) is a great way to explore a programming language at your own pace. Try the prompt below, read the response carefully, and test the code examples it gives you in the online editor.
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### Discovery: Transforming text
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**AI Prompt:**
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```In C#, how can I change a string input to all uppercase or all lowercase? Can you show me examples?```
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**After the AI responds:** Look closely at the code examples it provides. Try modifying your greeting program to display the user's name in uppercase or lowercase.
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<details>
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<summary>Show answer</summary>
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You can use the following string methods to transform text:
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```csharp
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string name = Console.ReadLine();
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// Converts to all uppercase
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string uppercaseName = name.ToUpper();
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// Converts to all lowercase
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string lowercaseName = name.ToLower();
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```
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</details>

‎Instructions/01a-build-user-interaction.md‎

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---
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lab:
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title: 'Challenge: Interact with the user'
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description: 'Write a C# program that combines Console.Write(), Console.ReadLine(), and string interpolation to collect multiple pieces of information from the user and display a personalized message.'
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level: 100
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duration: 15
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islab: true
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status: 'released'
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---
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# Challenge: Interact with the user
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You've learned the basics of C# console output, user input, and string manipulation. In this exercise, you put it all together by writing a program that asks the user two questions and combines their answers into a single personalized message.
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This exercise takes approximately **15** minutes.
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## Open the online C# IDE
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You'll write and run your code using an online C# editor — no installation required.
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1. Open a browser and navigate to the C# editor at [https://microsoftlearning.github.io/c-sharp-minor](https://microsoftlearning.github.io/c-sharp-minor).
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2. You'll see two panels:
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- **Code Editor pane** (top): where you write your C# code.
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- **Output Console** (bottom): where output is displayed and where you can type input when the program asks for it.
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3. The editor may contain some default code. Select all of it and delete it so you're starting with a clean, empty file.
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## Set up your program
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Before writing any logic, you'll paste a set of guiding comments into the editor. These comments act as an outline for your program — each one marks where a specific piece of code belongs.
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1. Copy the following comments and paste them into the editor pane:
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```csharp
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// Ask for the user's name
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// Ask for the user's age
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// Display a personalized message that includes both pieces of information
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```
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Remember, comments are ignored by C# when the program runs. They're just there to help you organize your code.
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## Ask for the user's name
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1. Beneath the `// Ask for the user's name` comment, add code that:
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- Uses `Console.Write()` to display the prompt `What is your name? ` (remember the space before the closing quote, so the user's answer doesn't run into the prompt)
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- Uses `Console.ReadLine()` to read the user's response into a variable named `name`
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> **Tip**: If you get stuck, look back at how you asked for the user's name in the [Create a personalized greeting](01-exercise-greeting.md) exercise.
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1. Select the ▶️ **Run** button to run the code so far, and type your name when prompted.
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1. Select the **Clear console** button to clear the output before you continue.
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## Ask for the user's age
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1. Beneath the `// Ask for the user's age` comment, add code that:
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- Uses `Console.Write()` to display the prompt `How old are you? `
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- Uses `Console.ReadLine()` to read the user's response into a variable named `age`
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> **Note**: `Console.ReadLine()` always returns a `string`, even if the user types a number. That's fine for this exercise — you can use the `age` variable directly inside a string interpolation without converting it to a number first.
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1. Run the program again, and answer both prompts when asked.
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1. Select **Clear console** before you continue.
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## Display a personalized message
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1. Beneath the `// Display a personalized message that includes both pieces of information` comment, add a `Console.WriteLine()` statement that uses string interpolation (`$"..."`) to combine the `name` and `age` variables into a single message.
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1. Run your program and check that the output looks similar to this, using the name and age you entered:
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```output
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What is your name? Sam
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How old are you? 25
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Hello, Sam! You are 25 years old.
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```
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> **Note**: If you get an error, check that you have double quotes around each piece of text, a semicolon at the end of each statement, and that `Console`, `Write`, `WriteLine`, and `ReadLine` are capitalized correctly.
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1. Select **Clear console** before you continue.
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## Verify your solution
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Compare your program to the example below. Your code doesn't need to match exactly — there are many ways to write a program that works correctly — but the behavior should be the same.
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```csharp
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// Ask for the user's name
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Console.Write("What is your name? ");
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string name = Console.ReadLine();
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// Ask for the user's age
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Console.Write("How old are you? ");
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string age = Console.ReadLine();
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// Display a personalized message that includes both pieces of information
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Console.WriteLine($"Hello, {name}! You are {age} years old.");
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```
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## Code with AI
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Using an AI assistant (like Copilot) is a great way to explore a programming language at your own pace. Try each prompt below, read the response carefully, and test the code examples it gives you in the online editor.
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### Discovery 1: Printing a decorative banner
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**AI Prompt:**
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```In C#, how can I print a line of 20 dashes in a row without typing them all out? Can you show me an example?```
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**After the AI responds:** Try using the technique it suggests to print a banner line above and below your program's final greeting.
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<details>
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<summary>Show answer</summary>
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You can use the `new string(char, count)` constructor to repeat a character multiple times. For example, to print 20 dashes in a row:
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```csharp
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Console.WriteLine(new string('-', 20));
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Console.WriteLine($"Hello, {name}! You are {age} years old.");
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Console.WriteLine(new string('-', 20));
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```
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</details>
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### Discovery 2: Formatting a multi-line message
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**AI Prompt:**
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```In C#, how can I display a message that spans multiple lines using a single Console.WriteLine() statement? Can you show me examples?```
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**After the AI responds:** Try modifying your program's final message so the name and age each appear on their own line.
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<details>
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<summary>Show answer</summary>
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You can use the newline escape character `\n` inside a regular string, or a verbatim/raw string that spans multiple lines. For example:
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```csharp
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Console.WriteLine($"Name: {name}\nAge: {age}");
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```
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</details>

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