enum Message {
    Quit,
    Move {x:i32,y:i32},
    Write(String),
    ChangeColor(i32,i32,i32),
}

impl Message {
    fn call(&self) {

    }
}



fn main() {
    let q = Message::Quit;
    let m = Message::Move{x:12,y:24};
    let w = Message::Write(String::from("Hello"));
    let c = Message::ChangeColor(0,255,255);

    m.call()
}

fn main() {
    let some_number = Some(5);
    let some_string = Some("string test");
    let absent_number : Option<i32> = None;
}

enum Coin {
    Penny,
    Nickel,
    Dime,
    Quarter,
}

fn value_in_cents(coin : Coin) -> u8 {
    match coin {
        Coin::penny => {
          println!("Penny");
            1
        },
        Coin::Nickel =>5,
        Coin::Dime =>10,
        Coin::Quarter =>20,
    }
}

fn main() {

}

fn plus_one(x : Option<i32>) -> Option<i32> {
    match x {
        None => None,
        Some(i) => Some(i+1)
    }
}


fn main() {
    let five = Some(5);
    let six = plus_one(five);
    let none = plus_one(None);
}