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


public class exampleRead
{
  public static void main(String[] args) throws IOException
  {
    Scanner keyboard = new Scanner (System.in);

    int accumulator =0;

/*
    for(int student=1; student<=2;student++)
    {

      for(int test=1;test<=4;test++)
      {

        System.out.println("Enter the grade for student number" + student + " for exam number " + test);
        accumulator +=keyboard.nextInt();
      }
    }
    System.out.println("The average for all tests for all students is " + (double)accumulator/8.0);
*/

/*
    File fileForScores = new File("scores.txt");
    
    Scanner input = new Scanner(fileForScores);
    
    while (input.hasNext()){
      accumulator += input.nextInt();
    }
    
    System.out.println("The average for all tests for all students is " + (double)accumulator/8.0);
*/   

    System.out.println("Enter the filename: ");
    
    Scanner board = new Scanner(System.in);
    
    String filename = board.nextLine();
    
    File fileForScores = new File(filename);
    
    if(!fileForScores.exists()){
      System.out.println("File not found, check that it's in the same place as class file");
      System.exit(0);
    }
    
    Scanner input = new Scanner(fileForScores);
    double counter =0.0;
    
    while (input.hasNext()){
      accumulator += input.nextInt();
      counter ++;
    }

    System.out.println("The average for all tests for all students is " + (double)accumulator/counter);


    input.close();
  }
}