Hello World

Classic Hello World program in Rust.

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

Unlike other popular counterparts, println! is a macro here instead of a function. It prints text to the console.

Comments

Rust supports Regular comments and Doc comments.

Regular Comments

Regular comments follow the general C++ style of line(//) and block(/* ... */) comment forms.

// Line Comment

/* 
 * This is a block comment.
 * It's useful for a big blob of comments.
 */

Doc Comments

Line doc comments beginning with exactly three slashes(///), and block doc comments(/** ... */), both outer doc comments, are interpreted as a special syntax for doc attributes.

Line comments beginning with //! and block comments /*! ... */ are doc comments that apply to the parent of the comment, rather than the item that follows.

/// Generate docs for the following item.

//! Generate docs for the enclosing item.

Code Challenge

Try to modify the code provided in the editor to make it print Hello, Rust! I'm a Rustacean!.

If that did print, congratulations! You've offically written a Rust program.