sorting problem

[saytri]

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.


[CODE=java]for(int j = 0; j < questions.lengt h; j++) {


int randomIndex = B[j];
String input = JOptionPane.sho wInputDialog(nu ll, questions[randomIndex]);


if(answers[randomIndex].equalsIgnoreCa se(input))
{
count++; // incrementing counter if entered answer is correct
point++;

correct++;
JOptionPane.sho wMessageDialog( null, "Congratulation s that is correct!");
}

else
{

JOptionPane.sho wMessageDialog( null, "Wrong Answer!");
}

if(!timeForMore ) // if time is over, the program executes the loop an stops asking questions.
break;
}


JOptionPane.sho wMessageDialog( null, "You answered " + count +
" out of " + questions.lengt h +
" questions correctly.");
int percent = (count*100)/questions.lengt h;
JOptionPane.sho wMessageDialog( null, "Your Geography Quiz score is " + point + " % ");




try {
BufferedWriter out;
String name = JOptionPane.sho wInputDialog(nu ll, "Enter your name");
String type = JOptionPane.sho wInputDialog(nu ll, "Enter your quiz type");




if(type.equals( "Plate Tectonics")){
out = new BufferedWriter( new FileWriter("pla yers.txt",true) );



out.write(name) ; //Writing to the textfile (the name entered by user)

out.write(getSp ace(20- name.length())) ; // Here 20 is max length possible change accordingly
String trimmedStr = name.trim();
out.write(Strin g.valueOf(point s+ " % "));
out.write(" ");
out.write(type) ;
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
out.close();


for(int i=1; i<points.length ; i++) {
for(int j=0; j<points.lengt h-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;
}

[/CODE]

[BigDaddyLH]

Is this an assignment? Do you have to code your own sort or can you simplify your life and use the sort methods of the API?

[saytri]

Yes its an assignment. I have to use a bubble sort. I tried doing it but its not sorting the scores.

[saytri]

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:

if(type.equals("Car")){
              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;
 
                }
 
            }
 
        }
            
             
             out.write(String.valueOf(percent));
 
           
             out.newLine(); 
             out.close();
            }

[r035198x]

Have you read this article first?

[saytri]

I have read it now. Thanks a lot. But the problem still remanains. Since i have to pass not a set of numbers to the array, but every score that the user scores, which is stored in the textfile. What do i have to pass to the array so it would read all the scores that are stored in the file. Thanks again.