Welcome & Hello World

🦀 Rust Lesson 1 Beginner

Rust is a modern systems programming language focused on safety, speed, and concurrency. Developed by Mozilla Research, it achieves memory safety without a garbage collector, making it a powerful replacement for C and C++.

1 Compiling in Rust

Rust is a statically compiled language. It uses `rustc` to compile code down into native binary execution files. Rust is built on three core pillars: memory safety (checked at compile time), absolute zero-cost abstractions, and concurrency free of data races.

2 Writing Hello World: The macro println!

Let's run a classic Hello World program in Rust:

Rust — Hello World ▶ Run Code

fn main() {
    println!("Hello, World!");
    print!("Welcome to Our Rust Compiler!\n");
}

Let's examine components:

fn main(): The entry point function for every Rust executable.
println!: A Rust **macro** (indicated by the exclamation mark `!`) that outputs text and appends a newline. Macros expand code during compiling, enabling compile-time argument checks.

3 Code Challenge

Challenge: Edit the code block. Use `println!` with placeholders (e.g. `println!("Value: {}", 42);`) to print your name and class rating numbers. Run the code.