Question:

Create a program that declares and initializes an array named numbers with 5 integer elements. Each element of the array should have a value that is twice the index position of that element. Finally, print the elements of the numbers array.

Answer:

public class DeclareInitializeArrayExample {
    public static void main(String[] args) {
        // Declaring an array named 'numbers' with size 5
        int[] numbers = new int[5];
        
        // Initializing the elements of the 'numbers' array
        for(int i = 0; i < numbers.length; i++) {
            numbers[i] = 2 * i;
        }
        
        // Printing the elements of the 'numbers' array
        for(int i = 0; i < numbers.length; i++) {
            System.out.println("Element at index " + i + ": " + numbers[i]);
        }
    }
}

Explanation:

In this program, we are declaring and initializing an array named numbers with 5 integer elements.

1. First, we declare an array of integers with size 5: int[] numbers = new int[5];
2. Then, we use a for loop to initialize the elements of the numbers array. The index i of the array is used to calculate the element value by multiplying 2 with i: numbers[i] = 2 * i;
3. To print the elements of the numbers array, we use another for loop. We iterate through each element using the index i and print the element value along with the index i: System.out.println("Element at index " + i + ": " + numbers[i]);

The output of the program will be:

Element at index 0: 0
Element at index 1: 2
Element at index 2: 4
Element at index 3: 6
Element at index 4: 8

This confirms that the array numbers has been successfully declared, initialized, and printed with the required values.