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Thread: logic error in for loops

  1. #1
    Junior Member
    Join Date
    Feb 2013
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    Default logic error in for loops

    I'm trying to get a program that displays all the numbers from 10 to 800 , 10 per line, that's divisible by 5 and 6 and having the numbers seperated by one space.

    Can someone tell me exactly what my for loops are really doing? When i run each loop alone, one iterates from 10 to 800 downward in a column and the other just goes in a row from 1 to 10.
    however when i run them together the program is terminated. Why is it doing this?

    import java.util.Scanner;
    public class a1 {
    	 * @param args
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		Scanner input = new Scanner(System.in);
    		for (int i = 10; i <= 800; i++) {
    			for (int j = 1; j <= 10; j++) {
    				if (i % 5 == 0 && i % 6 == 0) {
    					System.out.print(i + " ");

  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Eastern Florida
    Thanked 2,460 Times in 2,411 Posts

    Default Re: logic error in for loops

    the program is terminated.
    Are there error messages? Please copy the full text and paste it here.

    Or if there are no errors, please explain what the problem is.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Member Chris.Brown.SPE's Avatar
    Join Date
    May 2008
    Fort Wayne, Indiana
    Thanked 31 Times in 31 Posts

    Default Re: logic error in for loops

    Your problem lies in your if statement. You need an OR instead of an AND. That will get you past your first problem. You then need to rethink how you are counting your 10 per line issue. Hope this helps to get you started.
    Writing code is your job, helping you fix and understand it is mine.

    <-- Be sure to thank and REP (Star icon) those who have helped you. They appreciate it!

  4. #4
    Join Date
    Sep 2012
    Thanked 14 Times in 14 Posts

    Default Re: logic error in for loops

    Rather than using a nested for loop, which tends to confuse, how about using a counter for the size of the rows.

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