Thread: I need help with this pseudocode!

--------- Please delete this thread, thank you for all your help! ---------

Welcome Chris07

....yeah, what KevinWorkman said.

---- Edited my original post ----

I would appreciate a quick response. Thanks in advance.

Originally Posted by Chris07

a quick response

I will take a shorter lunch break next time. No, on second thought I will continue to volunteer my time when I feel like it, thanks for the consideration anyway.
Please post all relevant code on the forum and not through a link. There is no guarantee a third party will continue to host the content over time.

What did your research say about a NullPointerException? The actual error message (which should also be included here when there is a question) will include line numbers to help locate the problem.

Jps, I've edited the post again and included further information on the error message.

Did you look up NullPointerException to see what causes it?
The error message tells you where to look, so look there for the cause of the NPE. Which variable is null and why was it not initialized?

The variable array is not initialized. So, I tried to add the following line of code:

public Sort(int[] oldArray, int sizeOfOldArray)
{
    sizeOfArray = sizeOfOldArray; 
    array = new int[sizeOfOldArray];    // <-- Added this line
    for( int i = 0; i < sizeOfArray; i++) {
        array[i] = oldArray[i];
}

I thought this should do the trick, but now it's giving me another error:

Arrays are numbered beginning with zero.
So an array with a size of 5 will have elements numbered 0 1 2 3 and 4

Considering the code in post #8, why are you passing the size of oldArray to the method? In java size is a property of an array and can be accessed through the array.
See the API on arrays for details

Okay, I got rid of the errors. Now, how do I sort the numbers from least to greatest? Here is my new code:

import java.util.Scanner;
import java.util.Random;
 
public class SortedArray
{
    int [] Array;
    int sizeOfArray;
    Sort sortedArray;
    Scanner input = new Scanner(System.in);
    public SortedArray()
    {
        System.out.print("Enter the number of values to put in the array: ");
        sizeOfArray = input.nextInt();
        Array = new int [sizeOfArray];
        System.out.println("");
        for(int i = 0; i < sizeOfArray; i++)
        {
            Random r = new Random();
            Array[i] = r.nextInt(100) + 1;
            System.out.println(Array[i]);
        }
        sortedArray = new Sort(Array, sizeOfArray);
        sortedArray.display();
    } 
}
 
 
public class Sort
{
  int[] array;
  int sizeOfArray;
  public Sort(int[] oldArray, int sizeOfOldArray)
  {
    sizeOfArray = sizeOfOldArray;
    array = new int [sizeOfArray];
    for( int i = 0; i < sizeOfArray; i++)
    {
        array[i] = oldArray[i];
    }
    sort();
  }
 
  public void display()
    { 
       for ( int i = 0; i < sizeOfArray; i++){
           System.out.println(array[i]);
       }
    }
 
  private void sort()
    {
        for (int i = 0; i < sizeOfArray; i++)
        {
            for (int j = 0; j < sizeOfArray; i++)
            {
                if (array[j] < array[j])
                {
                    swap(j,i);
                }
            }
        }
    }
 
    private void swap(int x, int y)
    {
        int temp;
        temp = array[x];
        array[x] = array[y];
        array[y] = temp;
  }
}

Thanks for all the help thus far, almost finished.

Originally Posted by Chris07

how do I sort the numbers

There are many sort algorithms. Which do you plan to use?
What steps must be taken to implement this type of sort?
List out the steps to take and work on one step at a time.
If you have any questions be sure to include details about which sort you are using and what step you are on with the question.

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