Arrays and Methods

Oh great Java Programmers,

I am so clueless on my homework assignments. I thought I might be on the right track but alas, I really have no idea. Perhaps if one of you fantastic people will help me with this problem, I might be able to figure out the second??

Here's the assignment:
Write a program that initializes an array with ten random integers and then prints four lines of output, containing:
1) Every element at an even index. 2) Every even element. 3) All elements in reverse order. 4) Only the first and last element.

Here is the code I have so far: (Please note that I don't really get the return statements of methods and how I would pull all of this together to get my final 4 lines of print)

Code:

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import java.util.Arrays;
import java.util.Scanner;
 
public class FourLines
{
        public static void main(String[] args)
        {
        }
        /** Read a series of inputs.
                @return an array continaing the numbers.
        */
        public static double[] readInputs()
        {
                final int LENGTH = 500;
                double[] data = new double[LENGTH];
                int currentSize = 0;
               
                System.out.println("Please enter values. Enter Q to quit:");
                Scanner in = new Scanner(System.in);
                while (in.hasNextDouble())
                {
                        if (currentSize >= data.length)
                        {
                                data = Arrays.copyOf(data, 2 * data.length);
                        }
                        data[currentSize] = in.nextDouble();
                        currentSize++;
                }
                return Arrays.copyOf(data, currentSize);
        }
        public static double[] evenIndex(double data)
        {
                for (int i = 0; i <= data.length; i = i + 2)
                {
                        System.out.println(i);
                        i++;
                }
        }
        public static double[] printEven(double data)
        {
                for (int i = 0; i <= data.length; i++)
                if (data / 2 == 0)
                {
                        System.out.println(data);
                        i++;
                }
                else
                {
                        i++;
                }
        }
        public static double[] printReverse(a[])
        {
                for (int i = data.length - 1; i >= 0; i--)
                {
                        System.out.println(data[i] + " ");
                }
                System.out.println();
        }
}

---

Thank you in advance for your help!!!
~Jaime

Besides the methods which get input and initialize the array, you can just return void. In your method to print even elements you have a logical error. What is 4 /2? Is 4 even? will 4 satisfy the condition in that method?

Quote:

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Originally Posted by sunde887

In your method to print even elements you have a logical error. What is 4 /2? Is 4 even? will 4 satisfy the condition in that method?

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It should be % instead of / right? Because I want things that have a remainder of 0.

As for the void statements, I think I get that, but would I still have the println statements in each of the methods?

Also, I'm getting a lot of "cannot find symbol" errors which I think is because I have things defined within the loops. However, I'm not sure where to put them so they go across all the loops.

If you want something accessible from other methods you may want to consider wider variable scoping, although you should aim to keep scoping to a minimum. Generally,if a method returns something, you must return something. If a method returns void you can just print stuff and not bother with return statements. Also, using % instead of / is correct.