fibo in rust

fibo.rs

fn main() {
	for x in 1..11 {
    	println!("{} -> {}", x, fibo(x));
    }
}

fn fibo(n: i32) -> f64 {
	let phi = (1_f64 + 5_f64.sqrt()) / 2_f64;
	(phi.powf(n as f64) / 5_f64.sqrt()).round()
}