JAVA PROGRAM

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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JAVA PROGRAM
 
Chapter 4. Homework Assignment (read instructions carefully)
Write a program that asks the user for the name of a file. The program should read all the numbers from the given file and display the total and average of all numbers in the following format (three decimal digits):
Total: nnnnn.nnn
Average: nnnnn.nnn
Class name: FileTotalAndAverage
 
double_input1.txt double_input2.txt
 
PLEASE MODIFY THIS CODE, SO WHEN I UPLOAD IT TO HYPERGRADE IT PASSES ALL THE TEST CASES, BECAUSE WHEN I UPLOAD IT TO HYPERGRADE IT DOES NOT PASS THE TEST CASES. IT HAS TO PASS ALL THE TEST CASES. I PROVIDED THE CORRECT OUTPUT AS A SCREENSHOT AS A REFERRENCE
 

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;
    }
}

 
 
 
 
 
 

 

 

 

Test Case 1

 

 

 
 
 
Please enter the file name: \n
double_input1.txtENTER
Total: -5,748.583\n
Average: -57.486\n
 

Test Case 2

 
 
 
Please enter the file name: \n
double_input2.txtENTER
Total: 112,546.485\n
Average: 56.273\n
 

Test Case 3

 
 
 
Please enter the file name: \n
double_input3.txtENTER
File 'double_input3.txt' does not exist.\n
Please enter the file name again: \n
double_input1.txtENTER
Total: -5,748.583\n
Average: -57.486\n
783.236
-16.811
912.147
-323.916
-715.310
90.318
686.803
593.818
-169.659
-765.043
-544.811
-23.785
115.358
441.790
-184.904
-377.776
296.707
-910.261
-460.320
-968.745
584.617
554.042
-899.552
544.751
905.852
-819.293
-46.760
-151.522
884.914
595.830
double_input1 (4).txt
7958.535399
-5218.042014
-1592.003415
-9784.591013
-5010.482188
-0.167315
-7788.445125
5608.893405
9100.873263
5544.198604
4551.439582
4928.647719
8089.621856
-3546.012174
-8520.509183
-2945.086234
3439.600378
3563.957045
-9961.258830
-300.614003
9446.017894
4196.918097
-3193.989848
-827.767355
-3918.970284
-7335.357971
6550.333520
-1155.182268
-4106.096382
-7034.258600
double_input2 (2).txt
Transcribed Image Text:783.236 -16.811 912.147 -323.916 -715.310 90.318 686.803 593.818 -169.659 -765.043 -544.811 -23.785 115.358 441.790 -184.904 -377.776 296.707 -910.261 -460.320 -968.745 584.617 554.042 -899.552 544.751 905.852 -819.293 -46.760 -151.522 884.914 595.830 double_input1 (4).txt 7958.535399 -5218.042014 -1592.003415 -9784.591013 -5010.482188 -0.167315 -7788.445125 5608.893405 9100.873263 5544.198604 4551.439582 4928.647719 8089.621856 -3546.012174 -8520.509183 -2945.086234 3439.600378 3563.957045 -9961.258830 -300.614003 9446.017894 4196.918097 -3193.989848 -827.767355 -3918.970284 -7335.357971 6550.333520 -1155.182268 -4106.096382 -7034.258600 double_input2 (2).txt
Test Case 1
Please enter the file name: \n
double_input1.txt ENTER
Total: -5,748.583 \n
Average: -57.486 \n
Test Case 2
Please enter the file name: \n
double_input2.txt ENTER
Total: 112,546.485 \n
Average: 56.273 \n
Test Case 3
Please enter the file name: \n
double_input3.txt ENTER
File 'double_input3.txt' does not exist.\n
Please enter the file name again: \n
double_input1.txt ENTER
Total: -5,748.583 \n
Average: -57.486 \n
Transcribed Image Text:Test Case 1 Please enter the file name: \n double_input1.txt ENTER Total: -5,748.583 \n Average: -57.486 \n Test Case 2 Please enter the file name: \n double_input2.txt ENTER Total: 112,546.485 \n Average: 56.273 \n Test Case 3 Please enter the file name: \n double_input3.txt ENTER File 'double_input3.txt' does not exist.\n Please enter the file name again: \n double_input1.txt ENTER Total: -5,748.583 \n Average: -57.486 \n
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