Structs

This lesson covers the struct, which groups several pieces of data together.

Writing struct Name { field: type, ... } lets you handle several values as a single type. Methods are defined inside an impl block.

The sample code defines struct Point { x: f64, y: f64 } and adds a method inside impl Point that calculates the distance between two points.

A common early stumble is that the struct definition and the method definitions (the impl block) are written separately. The shape of the data lives in struct and the behaviour lives in impl — a split that sets Rust apart from classes in C++ or Java.

In professional work, structs are the usual way to represent a bundle of data such as a coordinate, a settings object, or an API response.

📖 Reference code

struct Point {
    x: f64,
    y: f64,
}

impl Point {
    fn distance(&self, other: &Point) -> f64 {
        ((self.x - other.x).powi(2) + (self.y - other.y).powi(2)).sqrt()
    }
}

fn main() {
    let p1 = Point { x: 0.0, y: 0.0 };
    let p2 = Point { x: 3.0, y: 4.0 };
    println!("Distance: {}", p1.distance(&p2));
}

✍️ Your code

Type your code, then press "Run"

🧪 This site can't compile or run Rust directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser — nothing is sent anywhere).