use std::fs::OpenOptions;
use std::io::Write;

pub fn main() {
	let mut file = OpenOptions::new().create(true).truncate(true).write(true).open("./cisla.txt").unwrap();
	let mut cisla = Vec::with_capacity(21);
	for i in 0..20 {
		let mut input = String::new();
		println!("Zadaj cislo {} z 20", i + 1);
		std::io::stdin().read_line(&mut input).unwrap();
		let inp: f64 = input.trim().parse().unwrap();
		cisla.push(inp);
	}
	let avg = cisla.iter().sum::<f64>() / 20f64;
	println!("priemer: {avg}");
	cisla.push(avg);
	file.write_all(cisla.iter().map(|f| f.to_string()).collect::<Vec<String>>().join("\n").as_bytes()).unwrap()
}