import java.util.*;

public class array2dproc
{
   
   static Scanner kb = new Scanner(System.in);
   
   public static void printArray2d(int[][] a)
   {
      int row, col;

      for (row = 0; row < a.length; row++)
      {
	 System.out.print("Values in row " + row + ": ");
	 for (col = 0; col < a[row].length; col++)
	   System.out.printf("%3d ", a[row][col]);
	 
	 System.out.println();
      }
      
   }
   
   public static void main(String[] args)
   {
      int[][] array;
      int row, col, x;
      double avg, sum;
      
      x = (int)(Math.random() * 9 + 2);
      System.out.println("\nCreating ragged array of " + x + " rows");
      System.out.println("Each row length between 2 and 10 integers.\n");
      
      // create x rows
      array = new int[x][];
      
      // create x columns for each row
      for (row = 0; row < array.length; row++)
      {
	 // range 0 through 8 + 2 yields 2 through 10
	 x = (int)(Math.random() * 9 + 2);
	 System.out.println("Row " + row + " is " + x +
			    " integers long.");
	 array[row] = new int[x];
      }
      
      // initialize the array with random numbers.
      System.out.println("\nInitializaing each row with random numbers.");
      for (row = 0; row < array.length; row++)
	 for (col = 0; col < array[row].length; col++)
	   array[row][col] = (int) (Math.random() * 100 + 1);

      // display array contents.
      printArray2d(array);
      
      // sum the array and calculate the average.
      System.out.println("\nCalculating average of each row.");
      for (row = 0; row < array.length; row++)
      {
	 sum = 0.0;
	 for (col = 0; col < array[row].length; col++)
	   sum = sum + array[row][col];

	 avg = sum / array[row].length;
      
	 System.out.printf("The average of row %d is %.2f\n",
			   row, avg);
      }
      
   }
}