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Thread: Not sure how the answer is acchieved

  1. #1
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    Default Not sure how the answer is acchieved

    I came across this question on a quiz for my course, I have spent over an hour staring at the code and cannot make heads or tails of it. I thought this would have populated the first index of the array with an value of '1' since the value of count at the first iteration of the while-loop would have been 0.

    Can someone explain to me how it populates the array with the values '18, 21, 24, 27, 30'.

     
    	public static void main(String[] args) {
    		int[] nums = new int[5];
    		int count = 0;
    		int val =1;
     
    		while (count<15) {
    			nums[count%5]+= val;
    			val++;
    			count++;
    		}
     
    		System.out.println(Arrays.toString(nums));
    	}

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Not sure how the answer is acchieved

    Have you tried playing computer with the code? Write after each statement what the values of the variables are after that statement is executed.
    Do that for all the statements until the loop ends.

    Another way to help see would be to add a print statement before the end of the loop that prints out the values of all the variables used in the loop.
    If you don't understand my answer, don't ignore it, ask a question.

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