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Thread: my for (int i =0; i < max; i++) loop wont count up but all the other variables in do

  1. #1
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    Default my for (int i =0; i < max; i++) loop wont count up but all the other variables in do

    OK...
    thanks for stopping to read

    this code is starting to annoy the crap out of me aha

    my issue is that the i in the for loop wont count up

    any one know why? please help

    **BTW i am a beginerish programmer**

    its this for loop:
    for (int i = 0; i < max; i=i+1) {
    				//m =store[i];
                    while (j<10){
                        g2.drawRect((i*SIZE), (LINE-((j+1)*SIZE)), SIZE, SIZE);
    					j++;
    					g2.drawString("Number of students =  " + i , 20, 20);
                    }
     
                }

    this is the rest of the code for this class:
    import java.awt.*;
    import javax.swing.*;
     
    public class BellCurve extends JComponent {
     
        public static final int SIZE = 10;
        public static final int LINE = SIZE*(62-10);
        private String [] values;
        Score s;
        public int students;
        public int k = 0;
    	private int f = 0;
    	private int j = 0;
    	private int l;
    	private int m;
    	private int max;
        private int [] scores;
        private int [] store;
     
     
        public BellCurve(String [] values) {
            this.values = values;
            s = new Score(values);
    		max = Integer.parseInt(values[2]);
    		store = new int[max];
        }
        public BellCurve() {
            this.values = new String [5];
            s = new Score(values);
    		max = 100;
    		store = new int[max];
        }
     
        public void paintComponent(Graphics g) {
    	        i = 0;
    		j = 0;
            Graphics2D g2 = (Graphics2D) g.create();
            //students = s.getStudents();
            //scores = s.getScore();
            g2.drawLine(0, LINE, 1020, LINE);
            g2.drawString("Range of marks =  " + s.getRMin() + " - " + s.getRMax(), 20, LINE+35);
            g2.drawString("Mean and Standard Deviation =  " + s.getMu() + ", " + s.getSigma(), 20, LINE+50);
            if (k<students){
                g2.drawString("Number of students =  " + k, 20, LINE+20);
    			//l=scores[k];
               // store[l]++; 
                for (int i = 0; i < max; i=i+1) {
    				//m =store[i];
                    while (j<10){
                        g2.drawRect((i*SIZE), (LINE-((j+1)*SIZE)), SIZE, SIZE);
    					j++;
    					g2.drawString("Number of students =  " + i , 20, 20);
                    }
     
                }
                k+=1;           
            }else{
            }
     
        }
     
     
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: my for (int i =0; i < max; i++) loop wont count up but all the other variables in

    the i in the for loop wont count up
    What do you see when you execute the code?
    How do you know what the the value of i is? Add a println statement inside the for statement that prints the value of i so you can see its value as the loop executes.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: my for (int i =0; i < max; i++) loop wont count up but all the other variables in

    Hi,

    According to your code, in method paintComponent() you have some errors: i is used just in the second line without a type and then you try to declare i again in the loop. The code should not compile at all.
    The problem is that the loop is not working or the code is not compile?
    But, for debuggind, you can try to put a System.out.println(String.valueOf(max)) just before
    for (int i = 0; i < max; i=i+1) {
    and check if the max is zero (if it's zero then the loop won't execute because the condition to loop is not satisfied).

    Chris
    Last edited by accexpert; October 5th, 2012 at 01:42 PM.

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