Adding all elements of an Array together, not adding up correctly

[Teclis]

import java.text.DecimalFormat;
import java.util.Scanner;
public class Lab11
{
   public static void main(String[] args)
   {
      final int arraySize = 30;
      final double SENT = -999.99;

      
      Scanner scan = new Scanner(System.in);
      DecimalFormat fmt = new DecimalFormat("0.00");
      double overallSum = 0;
      int overallNum = 0;
      double sum, average, overallAver = 0;
      int num;


      
      double[] dArr = new double[arraySize];


      
      while(scan.hasNext())
      {


         
         num = readData(scan, dArr, SENT);

         
         sum = sumNumbers(dArr, num);
System.out.println(sum + "     " + num);
         overallSum += sum;
         overallNum += num;


         
         System.out.println("The average of the group is "
                            + fmt.format(sum/num));

      } 

      
      System.out.println("The average overall inputs is "
                         +fmt.format(overallSum/overallNum));

   } 


   public static int readData(Scanner scan, double[] dArr, double sent)
   {
     
      int n;
          n = 0;
      double dB = scan.nextDouble();

      
      while(dB != sent)
      {
         
         if(n >= dArr.length)
         {
            System.out.println("Error: Not enough room in array;"
                               + "Quitting Program ");
            System.exit(0);
         }

         
         dArr[n] = dB;
         n++;
         dB = scan.nextDouble();

      }  


      
      return n;

   } 

   public static double sumNumbers(double[] dArr, int num)
   {
      double sum = 0;
      
      for(int i = 0; i < dArr.length; i++)
      {
         sum = sum + dArr[i];
      }
      
      return sum;
   }

}

The input is

0.7497790548868464
0.6462076498775827
0.32616335534841256
0.37582682849958304
-999.99
0.41621372481399
0.6463706270883212
0.7655177221930171
0.2650562905607654
0.14762994129539841
0.9627229328823885
-999.99
0.08133929860959621
0.9560335264804165
0.8155875415237163
-999.99
0.019074104888079813
0.8270564200270186
-999.99

From the group beginning with "0.08133929860959621", and the following group beginning with "0.019074104888079813", they do not add correctly. I'm not really sure why.

[Teclis]

Figured it out, instead of

for(int i = 0; i < dArr.length; i++)

I used

for(int i = 0; i < num; i++)

and it worked like a charm.