fn main(){
    // this_is_snake_case
    // thisIsCamelCase
    for i in 1..4 {
        println!("i = {}", i);
    }
    let a_as_a_snake = [2, 3, 5, 7, 11, 13, 17, 19];
    for prime in a_as_a_snake.iter() {
        println!("{}", prime);
    }

    let mut i :u32 = 0;
    while i < 5 {
        println!("i = {}", i);
        i += 1;
    }

}