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Thread: array bubble sort

  1. #1
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    Default array bubble sort

    hello
    Okay, with this bit of code im working on listing a disorganized double array into ascending order. I used an example from my text book to run organize using bubble sort. Only issue is that when the computer prints out disorganized, it returns as [D@42e816

    import java.util.*;
    public class SortDoubles
    {
    public static void main(String[] args)
    {
    double[] disorganized = {0.19, 5.16, 45, 4.5, 32, 23.1, 6.52, 41, 15.3, 3.69, 12.35, 80, 62.2, 81.5, 75.6};
    double temp;
    int a;
    int b;


    a = disorganized.length;

    for(b = 0; b < (a - 1); ++b)
    {
    temp = disorganized[b];
    disorganized[b] = disorganized[b + 1];
    disorganized[b + 1] = temp;
    }
    System.out.print(disorganized[]);
    }
    }


  2. #2
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    Default Re: array bubble sort

    Im still new to this. as Im reading my code Im thinking I need to include an if statement to check then switch the two numbers around inside of the for loop

  3. #3
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    Default Re: array bubble sort

    Your code won't compile.

    If you use the name of an array in a print or println statement, it prints something about the array and a hashcode that is important to Java and to certain debuggers, but fairly meaningless to "normal" programs and "normal" programmers.

    If you want an easy to print the contents of an array, you can use the Arrays Class static "toString" method:
        System.out.println("Plain vanilla disorganized   : " + disorganized);
        System.out.println("Arrays.toString(disorganized): " + Arrays.toString(disorganized));

    Output
    Plain vanilla disorganized   : [D@e53108
    Arrays.toString(disorganized): [5.16, 45.0, 4.5, 32.0, 23.1, 6.52, 41.0, 15.3, 3.69, 12.35, 80.0, 62.2, 81.5, 75.6, 0.19]


    Reference: Java Arrays Class


    Of course you can do it with individual print statements in a loop if you want some control over formatting of the output (one array element per line, for example).

    Anyhow, whatever method you use to show the contents, you can now proceed with debugging the sort functionality.


    Cheers!

    Z

  4. The Following User Says Thank You to Zaphod_b For This Useful Post:

    Olympaphibian89 (November 1st, 2012)

  5. #4
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    Default Re: array bubble sort

    huzzah!!! I got it working. I just sat here and really stared at it for a while. then I ran into the problem of this just going through the list once and it would print.
    Posting this in case anyone else can use this to help em out.

    import java.util.*;
    public class SortDoubles
    {
    public static void main(String[] args)
    {
    double[] disorganized = {0.19, 5.16, 45, 4.5, 32, 23.1, 6.52, 41, 15.3, 3.69, 12.35, 80, 62.2, 81.5, 75.6};
    double temp;
    int a;
    int b;
    int c;


    a = disorganized.length;
    for(b = 0; b < (a - 1); ++b)
    for(c = 0; c < (a - 1); ++c)
    if(disorganized[c] > disorganized[c + 1])
    {
    temp = disorganized[c];
    disorganized[c] = disorganized[c + 1];
    disorganized[c + 1] = temp;
    }
    for(b = 0; b < (a - 1); ++b)
    System.out.print(disorganized[b] + ", ");
    }
    }

  6. #5
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    Default Re: array bubble sort

    huzzah!!! I got it working. I just sat here and really stared at it for a while. then I ran into the problem of this just going through the list once and it would print.
    Posting this in case anyone else can use this to help em out.

    import java.util.*;
    public class SortDoubles
    {
    public static void main(String[] args)
    {
    double[] disorganized = {0.19, 5.16, 45, 4.5, 32, 23.1, 6.52, 41, 15.3, 3.69, 12.35, 80, 62.2, 81.5, 75.6};
    double temp;
    int a;
    int b;
    int c;


    a = disorganized.length;
    for(b = 0; b < (a - 1); ++b)
    for(c = 0; c < (a - 1); ++c)
    if(disorganized[c] > disorganized[c + 1])
    {
    temp = disorganized[c];
    disorganized[c] = disorganized[c + 1];
    disorganized[c + 1] = temp;
    }
    for(b = 0; b < (a - 1); ++b)
    System.out.print(disorganized[b] + ", ");
    }
    }

  7. #6
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    Default Re: array bubble sort

    Output:
    0.19, 3.69, 4.5, 5.16, 6.52, 12.35, 15.3, 23.1, 32.0, 41.0, 45.0, 62.2, 75.6, 80.0,


    Aren't you missing something in your printout? (What happened to 81.5?)


    Cheers!

    Z
    Last edited by Zaphod_b; November 1st, 2012 at 06:56 PM.

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