fn main(){
    for number in 0..3 {
        println!("Number = {}", number);
    }
    let x = 5;

    let mut nlist = [2, 3, 5, 7, 11, 13, 17, 19];
    for number in &mut nlist {
        println!("nlist Number = {}", number);
        *number += 500;
    }
    for number in nlist.iter() {
        println!("nlist Number = {}", number);
    }
}