import java.util.Scanner;

import java.io$.*$;

import java.io$.$PrintWriter;

$/**$

This class reads numbers from a file, calculates the mean and standard deviation, and writes the results to a file.

$*/$

public class StatsDemo $\{$

public static void main$($String$[]$ args$)$ throws IOException $\{$

$//$ Create an object of type Scanner

Scanner keyboard $=$ new Scanner $($System$.$in$)$;

$//$ Prompt the user and read in the file name

System.out.println$("$This program calculates $"+$

"statistics on a file $"+$ "containing a series of numbers"$)$;

System.out.print$("$Enter the file name: $")$;

String filename $=$ "Results.txt$"$;

filename $=$ keyboard.nextLine$()$;

$//$ To hold a value from the file

double value $=0$;

$//$ The sum of the numbers

double sum $=0$;

$//$ The number of numbers added

int count $=0$;

$//$ The average of the numbers

double mean $=0$;

$//$ The standard deviation

double stdDev $=0$;

$//$ The value and mean difference

double difference;

$//$ ADD LINES FOR TASK #$4$ HERE

$//$ Create a Scanner object passing it a File object

$//$ with the name of the file.

$//$ Loop until you are at the end of the file

$//$ Read a double value from the file

$//$ Add the value to sum

$//$ Increment the counter

$//$ After the loop finishes, close the input file

$//$ Store the calculated mean in the mean variable

$///$ ADD LINES FOR TASK #$5$ HERE

$//$Create a Scanner object passing it a File object with the name of the file.

$//$Reinitialize sum to $0.$

$//$Reinitialize count to $0.$

$//$Loop until you are at the end of the file.

$//$Read a double value from the file.

$//$Subtract the mean from the value.

$//$Add the square of the difference to the sum.

$//$Increment the counter.

$//$After the loop finishes, close the input file.

$//$Store the calculated standard deviation in stdDev.

$//$ADD LINES FOR TASK #$3$ HERE

$//$Create a PrintWriter object using "Results.txt$"$

$//$PrintWriter writer $=$ new PrintWriter$("$Results$.$txt$")$;

$//$Print the results to the output file

PrintWriter output $=$ new PrintWriter$("$Results$.$txt$")$;

output.printf$("$The mean is: $\%\mathrm{.}3$f

$"+$ "The standard deviation is: $\%\mathrm{.}3$f

$",0\mathrm{.}000,0\mathrm{.}000)$;

$//$Close the output file

output.close$()$;

$//$writer$.$close$()$;

keyboard.close$()$;

$\}$

$\}$ not getting output of mean $=0\mathrm{.}000$ and standard deviation $=0\mathrm{.}000$ after compiling and running my java code