import java.util.Scanner;

class Oct16 {
	public static void main(String[] args) {

		Scanner kb = new Scanner(System.in);

		int[] arr = new int[10];  // declare the array

		arr[3] = 7;		// set elm at index 3 to 7
		
		int elm = arr[3];	// get elm at index 3

		System.out.printf("elm at index 3: %d\n", elm);
		System.out.printf("elm at index 3: %d\n", arr[3]);
		
		for(int i = 0; i < arr.length; i++) {
			System.out.printf("%d ", arr[i]);
		}
		System.out.println();

		// Store 10 integers entered by user in array
		System.out.print("Enter 10 integers: ");

		for(int i = 0; i < arr.length; i++) {
			arr[i] = kb.nextInt();
		}

		System.out.println(arr);  // prints reference

		for(int i = 0; i < arr.length; i++) {
			System.out.printf("%d ", arr[i]);
		}
		System.out.println();

		for(int elm2 : arr) {			// for-each loop
			System.out.printf("%d ", elm2);
		}
		System.out.println();

		// compute mean
		int sum = 0;
		for(int i = 0; i < arr.length; i++) {
			sum = sum + arr[i];
		}
	
		double mean = sum / (double) arr.length;  // cast length to double
		System.out.printf("mean: %.2f\n", mean);

	}
}