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Thread: sorting problem

  1. #1
    mcal is offline Member
    Join Date
    Jan 2008
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    Default sorting problem

    I've got a problem in sorting. I have to use a bubble sort to sort the scores with those who bring the highest percent at the top. The scores of each user i saved in a text file. This is how i tried to do the sorting but its not working. Can someone pls help me out. Thanks a lot.

    Java Code:
           for(int j = 0; j < questions.length; j++) {
               int randomIndex = B[j];
              String input = JOptionPane.showInputDialog(null, questions[randomIndex]); 
               count++;  // incrementing counter if entered answer is correct
    		   JOptionPane.showMessageDialog(null, "Congratulations that is correct!");
    				JOptionPane.showMessageDialog(null, "Wrong Answer!");
    	if(!timeForMore) // if time is over, the program executes the loop an stops asking questions.
                JOptionPane.showMessageDialog(null, "You answered " + count +
                                          " out of " + questions.length +
                                          " questions correctly.");
                int percent = (count*100)/questions.length;
            JOptionPane.showMessageDialog(null, "Your Geography Quiz score is " + point + " % ");
                 try {
                  BufferedWriter out;
                  String name = JOptionPane.showInputDialog(null, "Enter your name");
                  String type = JOptionPane.showInputDialog(null, "Enter your quiz type");
                 if(type.equals("Plate Tectonics")){
                      out = new BufferedWriter(new FileWriter("players.txt",true));
                 out.write(name); //Writing to the textfile (the name entered by user)
                 out.write(getSpace(20- name.length())); // Here 20 is max length possible change accordingly
                 String trimmedStr = name.trim();
                 out.write(String.valueOf(points+ " % "));
                 out.write("         ");
                 out.newLine(); //write a new line to the textfile so the next time it writes to the file it does it on the next line
                   for(int i=1; i<points.length; i++) { 
                   for(int j=0; j<points.length-i; j++) { //if in wrong order then swap  
                    if (points[j]>points[j+1]) swap(points, j, j+1); 
    private static void swap (int[] points, int i, int j) { 
         int h = points[i]; 
         points[i] = points[j]; 
         points[j] = h; 

  2. #2
    mcal is offline Member
    Join Date
    Jan 2008
    Rep Power


    My problem is that the program isn't sorting the high scores. In my program according to my tutor i have to use a bubble sort. The program is cpompiling and it is displaying the score. The problem is that its not sorting them. I think the problem is because i'm only passing one number to the array everytime a user does his turn in the game. The scores one scored are written directly into a text file. Therefore my problem is how to sort these numbers since they are stored in a textfile. Pls i really am lost. I really appreciate any help. Thanks a lot.

    This is the code:

    Java Code:
                  out = new BufferedWriter(new FileWriter("players.txt",true));
                 int a[] = {percent}; //what do i need to pass here so the array can read all the scores that are stored in the textfile together with the new                score.
                 int i;
                 int temp, counter, index;
                 int length=0;
                 for(counter=0; counter<length-1; counter++) { //Loop once for each element in the array.
                   for(index=0; index<length-1-counter; index++) { //Once for each element, minus the counter.
                    if(a[index] > a[index+1]) { //Test if need a swap or not.
                        temp = a[index]; //These three lines just swap the two elements:
                       a[index] = a[index+1];
                        a[index+1] = temp;
    Thanks a lot.

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