Program Will Not Terminate

Question

The program isnt terminating because of the line
while(fileScan.hasNext()). There are 18 lines in the text file that is being scanned from but commandcount only allows 16 because of this line:
while(position < commandcount)
That is what I want to happen, only I want the prorgram to terminate after printing the 16 lines. Any suggestions. Its much appreciated.
import java.util.Scanner;
import java.io.*;
import java.text.DecimalFormat;
public class Calculator
    public static void main (String[] args) throws IOException
        final String filepath = "calculator.txt";
        int position = -1;
        int commandcount;
        int count = -1;
        double data;
        double x = 0;
        double answer = 0;
        String command, commandline, answerstring;
        DecimalFormat fmt = new DecimalFormat ("0.000");
        Scanner fileScan = new Scanner(new File(filepath));
        commandcount = fileScan.nextInt();
        fileScan.nextLine();
           while(fileScan.hasNext())
              while(position < commandcount)
              commandline = fileScan.nextLine();
              Scanner commandlineScan = new Scanner(commandline);
              command = commandlineScan.next();
              data = commandlineScan.nextDouble();
              if (command.equals("sin"))
                {data = Math.toRadians(data);
                answer = Math.sin(data);
                System.out.println(commandline + " = " + fmt.format(answer));}
              else if (command.equals("cos"))
                {data = Math.toRadians(data);
                answer = Math.cos(data);
                System.out.println(commandline + " = " + fmt.format(answer));}
              else if (command.equals("tan"))
                {data = Math.toRadians(data);
                answer = Math.tan(data);
                System.out.println(commandline + " = " + fmt.format(answer));}   
              else if (command.equals("sqrt"))
                {answer = Math.sqrt(data);
                System.out.println(commandline + " = " + fmt.format(answer));}
              else if (command.equals("abs"))
                {answer = Math.abs(data);
                System.out.println(commandline + " = " + fmt.format(answer));}
              else if (command.equals("n!"))
                 {for(x = data; data > 1; data--)
                    x *= data - 1;
                 answer = x;
                System.out.println(commandline + " = " + fmt.format(answer));}
              else if (command.equals("inv"))
                {answer = 1/data;
                System.out.println(commandline + " = " + fmt.format(answer));}
              else if (command.equals("pow"))
                {while(commandlineScan.hasNext())
                  {double b = commandlineScan.nextDouble();
                  answer = Math.pow(data, b);
                  System.out.println(commandline + " = " + fmt.format(answer));
              else if (command.equals("min"))
                {answer = data;
                while (commandlineScan.hasNext())
                  {double num = commandlineScan.nextDouble();
                  if (num < answer)
                    answer = num;
                System.out.println(commandline + " = " + fmt.format(answer));
              else if (command.equals("max"))
                {answer = data;
                while (commandlineScan.hasNext())
                  {double num = commandlineScan.nextDouble();
                  if (num > answer)
                    answer = num;
                System.out.println(commandline + " = " + fmt.format(answer));
              else if (command.equals("+"))
                {answer = data;
                while (commandlineScan.hasNext())
                  {double num = commandlineScan.nextDouble();
                   answer += num;
                System.out.println(commandline + " = " + fmt.format(answer));   
              else if (command.equals("-"))
                {answer = data;
                while (commandlineScan.hasNext())
                  {double num = commandlineScan.nextDouble();
                   answer -= num;
                System.out.println(commandline + " = " + fmt.format(answer));   
              else if (command.equals("*"))
                {answer = data;
                while (commandlineScan.hasNext())
                  {double num = commandlineScan.nextDouble();
                   answer *= num;
                System.out.println(commandline + " = " + fmt.format(answer));   
              else if (command.equals("/"))
                {answer = data;
                while (commandlineScan.hasNext())
                  {double num = commandlineScan.nextDouble();
                   answer /= num;
                System.out.println(commandline + " = " + fmt.format(answer));   
              else if (command.equals("%"))
                {answer = data;
                while (commandlineScan.hasNext())
                  {double num = commandlineScan.nextDouble();
                   answer %= num;
                System.out.println(commandline + " = " + fmt.format(answer));   
              else if (command.equals("average"))
                {answer = data;
                while (commandlineScan.hasNext())
                  {double num = commandlineScan.nextDouble();
                   answer += num;
                   count++;
                answer /= count; 
                System.out.println(commandline + " = " + fmt.format(answer));   
               ++position;                     
}

Answer 1

After the inner while loop add:
if (position >= commandcount) {
  fileScan.close();
}Not necessaily the best fix, but at least a quick one.
Edit: Just remember to catch the IllegalStateException.
Or, to avoid the exception do (this time before the while loop rather than after, else if the file contains exactly as many lines as needed it will result in a different exception)
if (position >= commandcount) {
  fileScan.nextLine();
}