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Thread: Need help determining if number is a palindrome using an array!

  1. #1
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    Default Need help determining if number is a palindrome using an array!

    I have:

    		public static void main(String[] args) {
    			while (true) {
    			display(check(retrieveInput()));
    			}
    			}
     
    			public static String retrieveInput() {
    			Scanner scan = new Scanner(System.in);
    			return scan.next();
    			}
     
    			public static boolean check(String input) {
    			boolean check = false;
    			try {
    			Integer.parseInt(input);
    			if (input.charAt(0)==input.charAt(4) && input.charAt(1)==input.charAt(3))
    			check = true;
     
    			} catch(Exception e) {
    			check = false;
    			}
     
    			return check;
    			}
     
    			public static void display(boolean check) {
    			if(check) System.out.println("Is a five-digit palindrome.");
    			else System.out.println("Is not a five-digit palindrome.");
    			}
    			}
    but the assignment is requiring me to use an array which I don't know how to do. Please Help!


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Need help determining if number is a palindrome using an array!

    Strip off each power of 10 and store that value in the array
    Given 123 the array would be {1,2,3}


    Please edit your post and wrap your code with
    [code=java]
    <YOUR CODE HERE>
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Need help determining if number is a palindrome using an array!

    Thanks for your reply. Sorry, this is my first java course. What do you mean by stripping off each power of ten?

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    Default Re: Need help determining if number is a palindrome using an array!

    This has nothing to do with java. Its basic math
    The number 123 is 1 * 10^2 + 2 * 10^1 + 3 * 10^0

    The programming part would Use the % and / operators to do the work
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help determining if number is a palindrome using an array!

    Thanks for the suggestions but I am not sure how to use those operators. Thanks again though.

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    Default Re: Need help determining if number is a palindrome using an array!

    23 % 10 = 3
    23 / 10 = 2
    If you don't understand my answer, don't ignore it, ask a question.

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