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Thread: Basic while loop issues

  1. #1
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    Default Basic while loop issues

    In my first program I was asked to output the perfect squares less than the value n.
    	int i = 0;
    	int x = 0;
    	int n = in.nextInt();
    		while (i < n)
    		{
    			i = x*x;
    			System.out.print(i + " ");
    			x = (x + 1);
    		}

    My issue is if I enter 90, it outputs 100. I know this is because after 9*9 it goes to 10*10 but how can I change it so it doesn't do this?

    My second issue is a bit more complicated and I have no idea what to do. I have to output all positive numbers divisible by 10 less than n:

    	int i = 0;
    	int x = 0;
    	int n = in.nextInt();
    		while (i < n && i > 0)
    		{
    			i = x/n;
    				if (i%10==0)
    				{
    					System.out.print(i + " ");
    				}	
    				else 
    				{
    					x = (n-1);
    				}
    		}

    my output is all zeros. Why?! How do I fix this?
    Last edited by Litost; October 8th, 2012 at 12:55 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Basic while loop issues

    my output is all zeros. Why?
    int x = 0;

    Also: i = x/n;
    if x < n because of integer math


    Try debugging the code by adding some println statements to print out the values of all the variables as they are set and used.
    Last edited by Norm; October 8th, 2012 at 07:18 AM.
    If you don't understand my answer, don't ignore it, ask a question.

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