Hello World

1. Welcome and Icebreaker:

Welcome! I’m excited to guide you through your first steps in Rust.

To get started, let’s have a little icebreaker: Have you ever tried to learn a new programming language before, and if so, what was the most challenging part about it?

2. Outline the Session:

Here’s what we’ll do in this session:

1. Concept Explanation: We will discuss the basic structure of a Rust program.
2. Live Coding Demonstration: We’ll write the “Hello, World!” program together, step by step.
3. Tasks: I will challenge you in task section

Learning Outcomes: By the end of this session, you will be able to:

• Understand the basic structure of a Rust program.
• Write, compile, and run a simple Rust program.

Expectations: I encourage you to ask questions at any point! The more interactive this is, the better you’ll learn.

3. Concept Explanation:

Every Rust program starts with a main function. This function is the entry point of your program – it’s where the execution begins. The code inside the main function’s curly braces {} is what gets executed.

In Rust, we use println! to print text to the console. The println! is a macro, which is a special kind of function that generates code. The exclamation mark ! indicates that it’s a macro and not a regular function. We put the text we want to print inside double quotes, and we pass that text as an argument to the println! macro.

4. Live Coding Demonstration:

Let’s write the code together. Open your favorite text editor or Rust IDE.

fn main() {
    println!("Hello, World!");
}

Let’s break this down:

• fn main(): This declares our main function. As mentioned, every Rust program needs one.
• { ... }: The curly braces enclose the body of the function – the code that will be executed.
• println!("Hello, World!");: This line does the actual printing.
  • println!: The macro for printing.
  • "Hello, World!": The text we want to print, enclosed in double quotes. This is a string literal.
  • ;: Almost every line in Rust ends with a semicolon. It tells the compiler that the statement is finished.

Saving and Running:

1. Save: Save the file as main.rs (or any name you like, but the .rs extension is important – it tells the system it’s a Rust file).
2. Open Terminal or CMD: Open your system in this directory.
3. Compile: Use the below code to compile your code.

rustc main.rs

1. Run

./main  # On Linux and macOS
.\\main.exe  # On Windows

You should see “Hello, World!” printed on your console!

5. Tasks

Modify the Greeting:

• Change the program to print “Hello, [Your Name]!” instead of “Hello, World!”. Make sure to replace [Your Name] with your actual name. Then, recompile and run the modified program.