fn only_positive(n: i32) -> Option<i32> {
    if n > 0 {
        return Some(n);
    }
    None
}

fn main() {
    let x = 5;
    let y = -6;

    match only_positive(x) {
        Some(value) => println!("The value is {}", value),
        None => println!("x is not positive")
    }

    match only_positive(y) {
        Some(value) => println!("The value is {}", value),
        None => println!("y is not positive")
    }
}