Question

Scanner scan = new Scanner(System.in);
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:

```java
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!