Assignment 8 tips

import java.text.NumberFormat;
import java.text.DecimalFormat;

public static void main(String[] args)
{
    Scanner inFile = null;
    try
    {
        inFile = new Scanner(new File(INFILE_NAME));
    }
    catch(FileNotFoundException e)
    {
        System.out.println("Error: " + e.getMessage());
        System.exit(1);
    }
    int count = inFile.nextInt();
    while(count != -1)
    {
        int[] data = new int[count];
        String values = "";
        for(int index = 0; index < count; index += 1)
        {
            data[index] = inFile.nextInt();
            values += data[index];
            if(index + 1 < count)
            {
                values += ", ";
            }
        }
        int sum = askSum(data);
        System.out.println(printer(count, values, sum));
        count = inFile.nextInt();
    }

    inFile.close();
}

private static String printer(int count, String values, int sum)
{
    NumberFormat formatter = new DecimalFormat("#0.00000");
    double realSqrt = Math.sqrt(sum);
    double estimatedSqrt = notLeibnizMethod(sum);
        String formattedSqrt = formatter.format(realSqrt);
    String formattedEstimation = formatter.format(estimatedSqrt);
    double diff = Math.abs(estimatedSqrt - realSqrt);
    NumberFormat diffFormatter = new DecimalFormat("#0.0000000");
    String formattedDiff = diffFormatter.format(diff);
    String toPrint = "Next Line has " + count + " number(s): " + values + "\n"
    + "Sum is:     " + sum + ", My square root:    " + formattedEstimation + ", Math.sqrt():    " + formattedSqrt + ", Diff: " + formattedDiff;
    return toPrint;
}