// CSE 143, Winter 2010, Marty Stepp
// This program tests a 'stutter' method for arrays.

import java.util.*;

public class ILoveStuttering {
    public static void main(String[] args) {
        int[] a = {4, 7, -2, 15, 6};
        int[] a2 = stutter(a);
        System.out.println(Arrays.toString(a2));
    }
    
    // Accepts an array of integers as a parameter and returns a new
    // array containing 2 copies of each element from the original.
    // For example, if the method is passed {4, 2, -1, 7}, 
    // it returns {4, 4, 2, 2, -1, -1, 7, 7}.
    // Assumes that a is not null.
    public static int[] stutter(int[] a) {
        int[] b = new int[2 * a.length];
        
        for (int i = 0; i < a.length; i++) {
            b[2 * i] = a[i];
            b[2 * i + 1] = a[i];
        }
        
        return b;
    }
}