Thread: Creating a program that reads from a file

Im working on a problem today and I getting errors for some reason.

Problem statement:

 
Design and implement an application that creates a histogram,
which allows you to visually inspect the frequency distribution
of a set of values.  The program should read in an arbitrary
number of integers that are in the range 1 to 100 inclusive;
then produce a chart similar to the one below that indicates
how many input values fell in the range 1-10, 11-20, and so on.
Print one asterisk for each value entered.

Here's the catch, making that problem is okay for me, but what if i wanted it to create it from reading values from a txt file?

This is my final code:

 
import java.util.*;
import java.io.*;
 
 
public class Histogram 
{
 
 
	public void displayIntArray(int[] iAr)
	{
		for(int index = 0; index < iAr.length; index++)	
		{
			System.out.println(iAr[index]);
		}
	}
 
 
	public int[] readIntArrayFromFile(String fileName) throws Exception
	{
		Scanner fileScan  = new Scanner(new File(fileName));
		int counter = 0;
		while(fileScan.hasNext())
		{
			fileScan.next();
			counter++;
 
		}
 
		int[] iArray = new int[counter];
 
		Scanner fScan  = new Scanner(new File(fileName));
		counter = 0;
		while(fScan.hasNext())
		{
			iArray[counter] = fScan.nextInt();
			counter++;
		}
 
		return iArray;
 
 
 
 
 
	}
 
	public int[] initializeCounterArray(int[] inArray) 
	{
		final int SIZE = 10;
		final int MIN = 1;
		final int MAX = 100;
		int[] counters = new int[SIZE];
		int n, nextt, ix;
 
 
		while (n < 0);
		{
		  int[] numbers = new int[n];
		}
 
 
		for (int index = 0; index < inArray.length; index++) 
		{
			int number = inArray[index];
			if (number >= MIN && number <= MAX) {
				int newIndex = (number - 1) / SIZE;
				counters[newIndex]++;
			}
 
		}
 
		return counters;
 
 
 
  // Creates the histogram values
 
  String[] stars = {" 1 - 10 |", "11 - 20 | ", "21 - 30 | ", "31 - 40 | ", "41 - 50 | ",
                 "51 - 60 | ", "61 - 70 | ", "71 - 80 | ", "81 - 90 | ", "91 - 100 | "};
 
  //10 strings for the different parameters
 
  for (ix = 0; ix < n; ix++) 
  {
      nextt = numbers[ix];
 
      if (nextt < 11) 
      {
          stars[0] += "*";
      } 
      else
      {
        if (nextt < 21) 
        {
          stars[1] += "*";
      } 
 
        else
        {
          if (nextt < 31) 
      {
          stars[2] += "*";
      }
      else
      {
        if (nextt < 41) 
      {
          stars[3] += "*";
      }
      else
      {
        if (nextt < 51) 
      {
          stars[4] += "*";
      } 
      else
      {
        if (nextt < 61) 
      {
          stars[5] += "*";
      } 
      else
      {
        if (nextt < 71) 
      {
          stars[6] += "*";
      } 
      else
      {
        if (nextt < 81) 
      {
          stars[7] += "*";
      } 
      else
      {
        if (nextt < 91) 
      {
          stars[8] += "*";
      } 
      else 
      {
          stars[9] += "*";
      }
  }
  for (ix = 0; ix < 10; ix++) {
      System.out.println(stars[ix]);
  }
 
}
      }
 
      }
      }
      }
        }
      }
  }
	}
}

I've got the driver class all good to go but just in case:

 
public class Driver 
{
	public static void main(String[] args) throws Exception
	{
		int[] numbers, counters;
		Histogram hist = new Histogram();
 
		numbers = hist.readIntArrayFromFile("data-8.3.txt");
		counters = hist.initializeCounterArray(numbers);
 
		hist.displayIntArray(counters);
	}
 
}

The only error im getting from this is the " nextt = numbers[ix]; " part of the code. ive tried implementing some commands at the top but nothing worked. But does everything look good? So if you feel that the code is not good, please feel free to make any required changes.

I appreciate everyone taking their time out of their day to help me out, it really means alot

Thank you!

Please copy and paste here the full text of the error messages you are getting.

 
Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	numbers cannot be resolved to a variable
 
	at Histogram.initializeCounterArray(Histogram.java:85)
	at Driver.main(Driver.java:10)

Im trying to create a histogram which reads values from a txt file and then displays how many of each corresponds in each interval.

For:

 
while (n < 0);
{
    int[] numbers = new int[n];
}

How could i resolve this issue? could i just declare numbers a brand new int[]?

Thanks!