Hello, World!

Your First Rust Program

Every Rust program starts with a main function — the entry point where execution begins:

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

The println! Macro

Notice the ! after println. That exclamation mark means println! is a macro, not a regular function. Macros in Rust are special — they are expanded at compile time and can take a variable number of arguments.

println! prints a line of text followed by a newline character. It supports format strings:

println!("Hello, {}!", "World");  // Hello, World!
println!("1 + 1 = {}", 2);        // 1 + 1 = 2

Comments

Single-line comments start with //:

// This is a comment
fn main() {
    println!("Hello!"); // inline comment
}

Compilation Model

Rust is a compiled language. Before a Rust program can run, it must be compiled by rustc (the Rust compiler) into a native binary. Here in Hypercode, compilation happens automatically via Miri — a Rust interpreter that runs your code directly.

Your Task

Print Hello, World! followed by Welcome to Rust! on separate lines.