fn factorial(x:isize) -> i64 {
	if x <= 1 {
		return 1;
	}
	return x * factorial(x - 1);
}

fn main() {
	{
		let mut x:isize = 1;
		while x < 10 {
			println!("{}", format!("{0:d}! = {1:d}", x, factorial(x)));
			x += 1.0;
		}
	}
}