fn low_square(x : u32) -> Result<u32, ()> {
    let res = x*x;
    if res > 100 {
        return Err(());
    } else {
        return Ok(res);
    }
}

fn main(){
    let result = match low_square(5) {
        Ok(r) => r,
        Err(_) => {
            println!("The number was too high!");
            panic!();
        }
    };
    println!("the answer is {}", result);

    let result = low_square(9).expect("The value given was too high!");
    println!("Next answer:  {}", result);

    println!("Another:  {}", low_square(3).expect("Hippos"));
}