Question

Lab 6 Instructions Objectives: • Executing and experimenting with programs that handle array related topics such as declaration, initialization, storing, retrieving, and processing elements. • Effectively manipulating and using ArrayList objects. • Becoming familiar with the use of arrays as method arguments and how array elements are passed to and returned from the called method. • Mastering the use of various debugging tools available on the Eclipse IDU. Important: EVERY one of the following Activities MUST be in a separate new Project. Also, all additional files that you need to complete this Lab (if any) are posted on Moodle. Activities: 1. This activity focuses on some basic array-manipulation skills. You are asked to create a program using your IDE that contains a few experiments with arrays. If you are asked to print out a value, be sure to print a label that indicates what the value represents, unless otherwise indicated. For example, if you are asked to print a variable z, the output might look like the following. Your program will perform the following eight tasks and its output should be similar to the given snapshot. z: 8.0 a. Create an array x of doubles with an initializer list that contains the following values: 8,4,5, 21,7,9, 18, 2, and 100. b. Print the number of items in the array by printing the expression x.length. Page 1 of 7
$c. Print the first array item, x[0]. Console X <terminated > Arrays [Java Application) C:\Program 1 d. Print the last array i$

Answer 1

Since you have posted multiple problems I will solve only first problem and all of its sub-problems.

1.

Code

import java.util.*;
class Array{
  
public static void main(String[] args){
//a)
double[] x = new double[] {8,4,5,21,7,9,18,2,100};
//b)
System.out.println("Length of x : " + x.length);
//c)
System.out.println("x[0] : " + x[0]);
//d)
System.out.println("x[8] : " + x[8]);
//e)
System.out.println("x[x.length - 1] : " + x[x.length - 1]);
//f)
for(int i = 0; i < 9; i++)
System.out.println(x[i]);
//g)
for(int i = 0; i < 9; i++)
System.out.println("x["+i+"] : " + x[i]);
//h)
for(int i = 8; i >= 0; i--)
System.out.println("x["+i+"] : " + x[i]);
//i)   
for(double element : x)
System.out.println(element);
}
}

Output

Length of x: 9 x[0] : 8.0 x[8] : 100.0 x[x.length - 1) : 100.0 8.0 4.0 5.0 21.0 7.0 9.0 18.0 2.0 100.0 x[0] : 8.0 x[1] : 4.0 x[2] : 5.0 x[3] : 21.0 X[4] : 7.0 x[5] : 9.0 x[6] : 18.0 x[7] : 2.0 x[8] : 100.0 X[8] : 100.0 x[7] : 2.0 x[6] : 18.0 x[5] : 9.0 x[4] : 7.0 x[3] : 21.0 x[2] : 5.0 x[1] : 4.0 x[0] : 8.0

.
x[0] : 8.0 x[1] : 4.0 x[2] : 5.0 x[3] : 21.0 x[4] : 7.0 x[5] : 9.0 x[6] : 18.0 x[7] : 2.0 X[8] : 100.0 X[8] : 100.0 x[7] : 2.0 x[6] : 18.0 x[5] : 9.0 x[4] : 7.0 x[3] : 21.0 x[2] : 5.0 x[1] : 4.0 x[0] : 8.0 8.0 4.0 5.0 21.0 7.0 9.0 18.0 2.0 100.0