enums

rust/book/src/main.rs

struct Meters(i32);
#[derive(Debug)]
enum Number {
    Integer(i32),
    Float(f32),
    NaN
}
fn main() {
    let x = 5; // x: i32
    println!("Meet you at ({}, {}).", p.x, p.y);
    let Meters(l) = Meters(3);
    println!("It's {}m until there, too long for me. Bye.", l)
    println!("It's {}m until there, too long for me. Bye.", l);
    // enums
    let i: Number = Number::Integer(3);
    let f: Number = Number::Float(3.1415);
    let n: Number = Number::NaN;
    println!("Here are some numbers: {:?}, {:?} and {:?}", i, f, n)
}