Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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JAVA PROGRAM
 
Lab #2. Chapter 7. PC #11. Array Operations (Page 491)
Write a program that accepts a file name from command line, then initializes an array with test data using that text file as an input. The file should contain floating point numbers (use double data type). The program should also have the following methods:
* getTotal. This method should accept a one-dimensional array as its argument and return the total of the values in the array.
* getAverage. This method should accept a one-dimensional array as its argument and return the average of the values in the array.
* getHighest. This method should accept a one-dimensional array as its argument and return the highest value in the array.
* getLowest. This method should accept a one-dimensional array as its argument and return the lowest value in the array.
 
 
double_input1.txt    double_input2.txt
 
WHEN I UPLOAD THE PROGRAM. TO HYPERGRADE IT DOES NOT PASS THE TEST CASES. 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.*;
import java.util.ArrayList;
import java.util.Scanner;

public class ArrayOperations {

    // Method to calculate the total of array elements
    public static double getTotal(double[] array) {
        double total = 0;
        for (double value : array) {
            total += value;
        }
        return total;
    }

    // Method to calculate the average of array elements
    public static double getAverage(double[] array) {
        return getTotal(array) / array.length;
    }

    // Method to find the highest value in the array
    public static double getHighest(double[] array) {
        double highest = array[0];
        for (double value : array) {
            if (value > highest) {
                highest = value;
            }
        }
        return highest;
    }

    // Method to find the lowest value in the array
    public static double getLowest(double[] array) {
        double lowest = array[0];
        for (double value : array) {
            if (value < lowest) {
                lowest = value;
            }
        }
        return lowest;
    }

    // Main function
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Prompt the user for the filename
        System.out.print("Enter the filename: ");
        String filename = scanner.nextLine();

        // Read data from the file and perform calculations
        try (Scanner fileReader = new Scanner(new File(filename))) {
            ArrayList<Double> arrayList = new ArrayList<>();

            // Read file and populate ArrayList
            while (fileReader.hasNextDouble()) {
                arrayList.add(fileReader.nextDouble());
            }

            // Convert ArrayList to array
            double[] array = new double[arrayList.size()];
            for (int i = 0; i < arrayList.size(); i++) {
                array[i] = arrayList.get(i);
            }

            // Display results by calling helper methods
            System.out.println("Total: " + getTotal(array));
            System.out.println("Average: " + getAverage(array));
            System.out.println("Highest: " + getHighest(array));
            System.out.println("Lowest: " + getLowest(array));
        } catch (FileNotFoundException e) {
            System.out.println("File: " + filename + " does not exist.");
        } finally {
            // Close the scanner
            scanner.close();
        }
    }
}

 
 
Test Case 1
Command Line arguments: double_input1.txt
Total: -1,813.080 \n
Average: -18.131 \n
Highest: 985.007 n
Lowest: -989.128 \n
Test Case 2
Command Line arguments: double_input2.txt
Total: -331, 368.178 \n
Average: -165.684 \n
Highest: 9,994.439 \n
Lowest: -9,988.269 \n
Test Case 3
Command Line arguments: double_input3.txt
File: double_input3.txt does not exist.\n
Test Case 4
Usage: java ArrayOperations <filename>\n
expand button
Transcribed Image Text:Test Case 1 Command Line arguments: double_input1.txt Total: -1,813.080 \n Average: -18.131 \n Highest: 985.007 n Lowest: -989.128 \n Test Case 2 Command Line arguments: double_input2.txt Total: -331, 368.178 \n Average: -165.684 \n Highest: 9,994.439 \n Lowest: -9,988.269 \n Test Case 3 Command Line arguments: double_input3.txt File: double_input3.txt does not exist.\n Test Case 4 Usage: java ArrayOperations <filename>\n
-283.760
-456.167
19.815.
-322.301
344.949
-850.533
-672.360
-188.767
646.462
-118.775
808.613
-746.865
-370.432
219.607
-166.298
-508.636
-989.128
-205.020
-928.165
-180.699
300.753
316.036
709.371
-886.860
-585.388
-554.302
-394.801
-970.233
905.941
787.854
double_input1 (5).txt ✓
5009.080090
4828.594369
411.259878
-9785.626617
-4609.476471
2719.918173
7138.901501
-3538.371855
2574.392712
-3297.930547
8398.465389
-3195.768547
-6157.859188
-370.717511
-294.048307
-8513.062201
-5510.607699
-1041.978813
9293.313108
-5017.205842
361.703495
-6699.960064
-9232.366356
1447.159382
-8435.569795
-2030.469644
5002.575706
-5820.459615
7003.075309
3755.916188
double_input2 (3).txt
expand button
Transcribed Image Text:-283.760 -456.167 19.815. -322.301 344.949 -850.533 -672.360 -188.767 646.462 -118.775 808.613 -746.865 -370.432 219.607 -166.298 -508.636 -989.128 -205.020 -928.165 -180.699 300.753 316.036 709.371 -886.860 -585.388 -554.302 -394.801 -970.233 905.941 787.854 double_input1 (5).txt ✓ 5009.080090 4828.594369 411.259878 -9785.626617 -4609.476471 2719.918173 7138.901501 -3538.371855 2574.392712 -3297.930547 8398.465389 -3195.768547 -6157.859188 -370.717511 -294.048307 -8513.062201 -5510.607699 -1041.978813 9293.313108 -5017.205842 361.703495 -6699.960064 -9232.366356 1447.159382 -8435.569795 -2030.469644 5002.575706 -5820.459615 7003.075309 3755.916188 double_input2 (3).txt
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