//Johnny A. Shaieb
//cs2003
//Lab4

import java.io.*;

public class Lab4
{

	public static void main(String args[])
	{
		String filename = "";
		if(args.length > 0)
		{
			filename = args[0];
		}
		else
		{
			filename = setFileName();
		}
		int number = countLines(filename);

		double[] array = popArray(filename, number); 
		System.out.println(number + " doubles read-in");

		printArray(array);

		double sum = sumIt(array,number-1);
		System.out.println();
		System.out.println("The Sum Using Recursion> " + sum);
		
	}


	public static String setFileName()
	{
		String filename = "";
		try
		{
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			System.out.print("Please Enter Filename> ");
			filename = br.readLine();
		}
		catch(IOException e)
		{
			System.out.println("Error> " + e);
		}
		return filename;
	}

	public static double sumIt(double[] a, int n)
	{
		if(n == 0)
		{
			System.out.println("First Number is " + a[n]);
			return a[0]; 
		}
		double temp = a[n] + sumIt(a,n - 1);
		System.out.println("The sum of the first " + (n+1) + " number is " + temp);
		return temp;
	}

	public static int countLines(String fname)
	{
		String filename = fname;
                String line = "";
                int count = 0;

                try
                {
                	FileReader in = new FileReader(filename);
                	BufferedReader br = new BufferedReader(in);
                        while((line = br.readLine()) != null)
                        {
                                //System.out.println("Line> " + line);
				count++;
                        }
			br.close();
                }
                catch(IOException e)
                {
                        System.out.println("Error> " + e);
                }
		return count;
	}

        public static double[] popArray(String fname, int i)
        {
                String filename = fname;
                String line = "";
		int max = i;
                int count = 0;

		double[] array = new double[max];

                try
                {
                        FileReader in = new FileReader(filename);
                        BufferedReader br = new BufferedReader(in);
                        while((line = br.readLine()) != null)
                        {
				array[count] = Double.parseDouble(line);
                                count++;
                        }
			br.close();
                }
                catch(IOException e)
                {
                        System.out.println("Error> " + e);
                }
		return array;
        }

	public static void printArray(double[] array)
	{
		double count = 0;
		System.out.println();
		for(int i = 0; i < array.length; i++)
		{
			System.out.println(array[i]);
			count = count + array[i];
		}
		System.out.println("Total> " + count);
		System.out.println();
	}

}