-38

src/u37.rs

@@ -1 +1,18 @@
-pub fn main() {}
+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()
+}