class Arrays {

	public static void main(String[] args) {

		// declare array
		// type[] identifier;

		// identifier = new type[size];

		// declare arr to hold a reference to an array of integers
		// and initialize arr to point to an array that can hold 3 integers.
		int[] arr = new int[3];

		// get size of the array and store in len
		int len = arr.length;

		System.out.println("length of array: " + len);

		//set element in position 0
		int position = 0;
		arr[position] = 21;

		arr[1] = 42;
		arr[2] = 63;

		System.out.println(arr);

		// print elements in order from the array
		for(int elm : arr) {
			System.out.print(elm + " ");
		}
		System.out.println();

		// print elements in order from the array
		for(int i = 0; i < arr.length; i++) {
			int elm = arr[i];
			System.out.print(elm + " ");
		}
		System.out.println();
	

	}
}