import java.util.*;
public class Getallenrij {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] a = {1,2,3,4};

        drukAf(gewogenSom(toArray(a)));
    }

    static public ArrayList<Integer> toArray (int[] a){
        ArrayList<Integer> lijst = new ArrayList<Integer>();
        for (int i = 0; i<lijst.size(); i++){
            Integer z = (int)(a[i]);
            lijst.add(z);
        }

        return lijst;
    }

    static public double[] gewogenSom (ArrayList<Integer> a){
        double[] rij = new double[a.size()];
        for (int i = 0; i<a.size(); i++){
            if (i==0){
                rij[i] = (0.25*(2*a.get(i) + a.get(i+1)));

            }

            else if (i == a.size()-1){
                rij[i] = 0.25*(a.get(i-1)+2*a.get(i));

            }

            else{
                 rij[i] = 0.25*(a.get(i-1)+2*a.get(i) + a.get(i+1));

            }

        }

        return rij;
    }

    static public void drukAf (double[] a){
        for (int i = 0; i < a.length; i++)
            System.out.print("[" + a[i] + "] ");
    }
}