import java.util.Scanner;

class L16 {
	public static void main(String[] args) {

		Scanner kb = new Scanner(System.in);

		System.out.println("Recitation Practice 6");	
		System.out.println("_____________________");

		//3-8

		int[] arr1 = new int[20];
		int len1 = arr1.length;
		System.out.println("Arr1 length: " + len1);
		for(int elm: arr1) {
			System.out.print(elm + " ");
		}
		System.out.println();

		for(int i = 0; i < len1; i++) {
			arr1[i] = -1;
		}
	
		for(int elm: arr1) {
			System.out.print(elm + " ");
		}
		System.out.println();
		
		//9-14
		String[] arr2 = new String[5];
		int len2 = arr2.length;
		System.out.println("Arr2 length: " + len2);

		for(String elm: arr2) {
			System.out.print(elm + " ");
		}
		System.out.println();
		
		for(int i = 0; i < 5; i++) {
			System.out.println("Please enter a string");
			String elm = kb.next();
			arr2[i] = elm;
		}

		for(String elm: arr2) {
			System.out.print(elm + " ");
		}
		System.out.println();
		
		//15-20
		int[] arr3 = {2,7,3,9,1,6,2};
		int len3 = arr3.length;
		System.out.println("Arr3 length: " + len3);
			
		for(int elm: arr3) {
			System.out.print(elm + " ");
		}
		System.out.println();
		
		for(int i = 0 ; i < len3; i++) {
			int elm = arr3[i];
			if (elm % 2 == 0) {
				arr3[i] = 0;
			}

		}			
		for(int elm: arr3) {
			System.out.print(elm + " ");
		}
		System.out.println();
	
		//21
		int[] arr4 = new int[5];
		for(int i = 0; i < arr4.length; i++) {
			System.out.println("Please enter an integer");
			arr4[i] = kb.nextInt();
		}
		double sum = 0.0;
		for(int i = 0; i < arr4.length; i++) {
			sum = sum + arr4[i];
		}
		System.out.println("Mean: " + (sum/5.0));

	}
}