Scanner scan = new Scanner(System.in);

Question

Long x = null;
Long y = NaN;

System.out.println(x + y);
System.out.println("Enter values:");
x = scan.nextLong();
y = scan.nextInt();

Double avg = (double)(x + y / 2);
System.out.println("Average of " + x + " and " + y + " is " + avg);

Debug the code provided in the starter file so it does the following: creates two Integer objects x and y, and initializes them as null prints the values of x and y (should result in the output "null null") sets x and y to inputs entered by the user finds the average of the two values and stores this in a Double value avg prints a sentence as shown in the sample run with the values of x, y and the average Hint - just as with Strings (see Unit 2: Lesson 1) we can explicitly assign any class-type variable as null just by typing = null Sample run:
Debug the code provided in the starter file so it does the following: creates two Integer objects x and y, and initializes them as null prints the values of x and y (should result in the output "null null") sets x and y to inputs entered by the user finds the average of the two values and stores this in a Double value avg prints a sentence as shown in the sample run with the values of x, y and the average Hint - just as with Strings (see Unit 2: Lesson 1) we can explicitly assign any class-type variable as null just by typing = null Sample run:

Answer 1

Here's how to debug the provided code to meet the requirements of creating two Integer objects, initializing them to null, printing their values (which should initially be null), taking user inputs, calculating the average, and printing the results. Below is the corrected and fully functional Java code:

import java.util.Scanner;

public class AverageCalculator {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        
        // Initialize Integer objects x and y to null
        Integer x = null;
        Integer y = null;

        // Print the initial values of x and y
        System.out.println(x + " " + y); // Should print "null null"
        
        // Prompt for user input
        System.out.println("Enter two integer values:");
        
        // Set x and y to inputs entered by the user
        x = scan.nextInt();
        y = scan.nextInt();

        // Calculate the average of the two values
        Double avg = (double)(x + y) / 2;

        // Print the average and the values of x and y
        System.out.println("Average of " + x + " and " + y + " is " + avg);
        
        // Close the scanner
        scan.close();
    }
}

Changes Made:

1. Class Type: Changed Long to Integer as specified in the requirements.
2. Initialization: Changed the initialization of y from NaN to null, making both x and y explicitly null at the start.
3. User Input: Used nextInt() for both x and y, which matches the type.
4. Average Calculation: The average calculation was corrected to (x + y) / 2 so it correctly computes the average.
5. Output Formatting: Combined the print statements for the average.

Sample Run:

When the program is run, the output will look like this:

null null
Enter two integer values:
4
6
Average of 4 and 6 is 5.0

Make sure to test various inputs when using the program interactively!