public class PrintArr
{

  // this is just a SAMPLE main() -- the point of this example is really 
  //  the printArray method
 public static void main(String[] args)
 {
   int[] list1 = {2, 4, 6, 8, 10};
   int[] list2 = new int[20];

   for (int i = 0; i < list2.length; i++)
      list2[i] = i * 3;

   System.out.println("The contents of list1: ");
   printArray(list1);
   System.out.println("The contents of list2: ");
   printArray(list2);

   double ans1 = average(list1);
   System.out.println("The average of list1 is: " + ans1);
   System.out.println("The average of list2 is: " + average(list2));

   int[] list3 = {-1, -4, 15, 9, -5, -2};
   System.out.println("The contents of list3: ");
   printArray(list3);
   int[] list4 = zeroNegArray(list3);
   System.out.println("The contents of list4: ");
   printArray(list4);
   System.out.println("The contents of list3: ");
   printArray(list3);
 }


 // method to print any integer array
 public static void printArray(int[] arr) 
 {
   System.out.print("{");
   int i;
   for (i = 0; i < arr.length-1; i++)
      System.out.print(arr[i] + ", ");

   System.out.println(arr[i] + "}");
 }

 public static double average(int[] arr)
 {
   int sum = 0;
   for ( int i = 0; i < arr.length; i++)
      sum = sum + arr[i];

   return (double)sum / arr.length;
 }
 
 // takes in an integer array, and returns an array that zeroes
 //   out any negative numbers in the original
 //   NOTE: This function does NOT change the original!!!!!!!
 public static int[] zeroNegArray(int[] arr)
 {
    int[] newarray = new int[arr.length];	// build new array
						//  same size as arr
    for (int i = 0; i < arr.length; i++)
    {
       if( arr[i] < 0 )
          newarray[i] = 0;
       else
          newarray[i] = arr[i];
    }

    return newarray;
 }

}