Our code so far.

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "hello"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "hello"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/main.rs

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+fn foo() {
+    println!("Hello from foo()");
+}
+
+fn answer_to_all_questions() -> u32 {
+    42
+}
+
+fn add_two_numbers(a: u32, b: u32) -> u32 {
+    a + b
+}
+
+trait Vector {
+    fn dot(&self, other: &Self) -> f32;
+    fn length(&self) -> f32;
+}
+
+struct Vector2 {
+    x: f32,
+    y: f32,
+}
+
+impl Vector2 {
+    pub fn new(x: f32, y: f32) -> Vector2 {
+        Vector2 { x, y }
+    }
+}
+
+impl Vector for Vector2 {
+    fn dot(&self, other: &Vector2) -> f32 {
+        self.x * other.x + self.y * other.y
+    }
+
+    fn length(&self) -> f32 {
+        self.dot(self).sqrt()
+    }
+}
+
+struct Vector3 {
+    x: f32,
+    y: f32,
+    z: f32,
+}
+
+impl Vector3 {
+    pub fn new(x: f32, y: f32, z: f32) -> Vector3 {
+        Vector3 { x, y, z }
+    }
+}
+
+impl Vector for Vector3 {
+    fn dot(&self, other: &Vector3) -> f32 {
+        self.x * other.x + self.y * other.y + self.z * other.z
+    }
+
+    fn length(&self) -> f32 {
+        self.dot(self).sqrt()
+    }
+}
+
+impl std::ops::Add for Vector3 {
+    type Output = Vector3;
+    fn add(self, other: Self) -> Self {
+        Vector3::new(self.x + other.x, self.y + other.y, self.z + other.z)
+    }
+}
+
+struct Meter {
+    value: f32,
+}
+
+impl Meter {
+    pub fn new(value: f32) -> Meter {
+        Meter { value }
+    }
+}
+
+struct SquareMeter {
+    value: f32,
+}
+
+impl SquareMeter {
+    pub fn new(value: f32) -> SquareMeter {
+        SquareMeter { value }
+    }
+}
+
+impl std::ops::Mul for Meter {
+    type Output = SquareMeter;
+
+    fn mul(self, rhs: Self) -> Self::Output {
+        SquareMeter::new(self.value * rhs.value)
+    }
+}
+
+fn main() {
+    let vec1 = Vector3::new(2.0, 0.0, 0.0);
+    let vec2 = Vector3::new(1.0, 1.0, 0.0);
+
+    let vec3 = vec1 + vec2;
+
+    let m1 = Meter::new(10.0);
+    let m2 = Meter::new(90.0);
+
+    let area = m1 * m2;
+
+    println!("Hello, world!");
+    println!("Answer to all questions: {}", answer_to_all_questions());
+    println!("Add two number: {}", add_two_numbers(23, 42));
+
+    println!("x: {}, y: {}, z: {}", vec3.x, vec3.y, vec3.z);
+
+    foo();
+}