JAVA PROGRAM

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.InputMismatchException;
import java.util.Scanner;

public class FileTotalAndAverage {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String fileName;

        do {
            System.out.print("Please enter the file name: ");
            fileName = scanner.nextLine();

            try {
                double[] numbers = readNumbersFromFile(fileName);
                if (numbers != null) {
                    double total = calculateTotal(numbers);
                    double average = calculateAverage(numbers);

                    System.out.printf("Total: %.3f\n", total);
                    System.out.printf("Average: %.3f\n", average);
                    break;  // Exit the loop if successful
                }
            } catch (IOException e) {
                System.out.println("File '" + fileName + "' does not exist.");
            } catch (InputMismatchException e) {
                System.out.println("Invalid data in the file. Please make sure the file contains only numeric values.");
            }
        } while (true);

        scanner.close();
    }

    private static double[] readNumbersFromFile(String fileName) throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(fileName));
        String line;
        double[] numbers = null;

        try {
            String[] tokens = reader.readLine().split("\\s+");
            numbers = new double[tokens.length];

            for (int i = 0; i < tokens.length; i++) {
                numbers[i] = Double.parseDouble(tokens[i]);
            }
        } finally {
            reader.close();
        }

        return numbers;
    }

    private static double calculateTotal(double[] numbers) {
        double total = 0;
        for (double num : numbers) {
            total += num;
        }
        return total;
    }

    private static double calculateAverage(double[] numbers) {
        double total = calculateTotal(numbers);
        return total / numbers.length;
    }
}