import java.util.*;
import java.io.*;

public class Inputenator
{
   private Scanner console;
   private Scanner fin;
   private int [] nums;
   private int offset, max, answer;
   
   Inputenator(String a)
   {
        console = new Scanner(System.in); 
   
          fin = new Scanner(new File(a));
        
        System.out.println("How many elements do you want in the array?");
        max = console.nextInt();
        console.nextLine();
        nums = new int[max];
   
    }
    private void menu()
    {
        System.out.println("Press 1 to read a number from the keyboard");
        System.out.println("Press 2 to read a number from the file");
        System.out.println("Once the array is full you can sum the numbers!");
    }
    public void theMenu()
    {
       
        int choice = 0;
        do{
            menu();
            switch(choice)
            {
                case 1:
                   keyboardInput();
                   break;
                case 2: 
                   fileInput();
                   break;
             }
             
            }while(choice != -1 || offset < max);
            calculate();
    } 
    public void keyboardInput()
    {
        System.out.println("Give the number to input:");
        int a = console.nextInt();
        console.next();
        nums[offset] = a;
        offset++;
    }
    public void fileInput()
    {
        int a = fin.nextInt();
        System.out.println("The next number put in the array is: " + a);
        nums[offset] = a;
        offset++;
    }
    public void calculate()
    {
      
        for(int i = 0; i<max; i++)
            answer += nums[i];
        System.out.println("The final total is : " + answer);    
        }
   public static void main(String [] args)
   {
       Inputenator input = new Inputenator(args[0]);
       input.theMenu();
    }
}