cassone.java

import java.io.*;
import java.util.*;

public class Cassone {

    static double kmToMill(double km) {
        double mill = km * 1.6;
        return mill;
    }

    public static void main(String[] args) {


        try {
            RandomAccessFile fileKi = new RandomAccessFile("szamok.txt", "rw");
            Scanner bill = new Scanner(System.in);
            double osszes = 0;
            int db = 0;
            while (true) {
                double szam = bill.nextDouble();
                if(szam == -1)
                    break;

                double mill = kmToMill(szam);

                osszes += mill;
                db++;

                System.out.println(mill + "\n");
                fileKi.writeBytes(mill + "\n");
            }
            System.out.println("átlag: " + osszes/db);
            fileKi.close();
        } catch(IOException e){
            System.err.println(e);
        }
    }
}