Structs

Structs

Structs let you group related data together under a named type.

Defining a Struct

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

Creating Instances

let p = Point { x: 1.0, y: 2.0 };
println!("{}", p.x); // 1

Use struct update syntax to create a new instance based on another:

let p2 = Point { x: 3.0, ..p }; // y copied from p

impl Blocks

Methods and associated functions live in impl blocks:

impl Point {
    // Associated function (no &self) — called as Point::new(...)
    fn new(x: f64, y: f64) -> Self {
        Point { x, y }
    }

    // Method — takes &self
    fn distance_to_origin(&self) -> f64 {
        (self.x * self.x + self.y * self.y).sqrt()
    }

    // Mutable method — takes &mut self
    fn translate(&mut self, dx: f64, dy: f64) {
        self.x += dx;
        self.y += dy;
    }
}

Tuple Structs

struct Color(u8, u8, u8);
let black = Color(0, 0, 0);
println!("{}", black.0); // 0

Your Task

Implement a Rectangle struct with width and height fields and these methods:

• new(width: f64, height: f64) -> Self
• area(&self) -> f64
• perimeter(&self) -> f64
• is_square(&self) -> bool
• scale(&self, factor: f64) -> Rectangle — returns a new scaled rectangle