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Thread: divisibility

  1. #1
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    Default divisibility

    i am working on an assignment, where i take a number from the whole number (so 1 from 122) and check if it divisible or not. i do this for every number. if every one is divisible, it returns true. if not, return false. i have been working on this, and for some reason, when I attempt to get the first one, i am getting the wrong data. here is my code:

    public class dividesSelf {
     
    	static boolean divide(int n) {
     
    		int x = 0;
    		int y;
    		int z;
     
    		String number = Integer.toString(n);
     
    		for(int i = 0; i<number.length(); i++) {
    			x = (int)number.charAt(i);
    		}
     
    		System.out.println(x);
     
    		return false;
     
    	}
     
    	public static void main(String[] args) {
    		System.out.println(divide(122));
    	}
     
    }


  2. #2
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    Default Re: divisibility

    A char is a subset of int that can also be represented as a unicode character. The int representation of a character has little to do with which character it is (so char '9' does not map to int 9). A fun project might be to write a program that prints out the int and character values of each char.

    That being said, you might want to check out the Integer class for some useful methods.
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  3. #3
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    Default Re: divisibility

    Quote Originally Posted by droidus View Post
    (so 1 from 122) and check if it divisible or not.
    Divisible by what?

    By the way here's a hint how to achieve this without Strings and chars (which just muddys the water as Kevin has pointed out).
    int number = 1234;
    System.out.println(number % 10);
    System.out.println(number / 10);
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  4. #4
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    Default Re: divisibility

    Why didn't they use 0 - 9 ASCII for the numbers 0 - 9? Seems unnecessarily confusing to me!
    So when you cast '9' to an int, you are actually getting the internal ASCII representation of '9'. From this table:
    Ascii Table - ASCII character codes and html, octal, hex and decimal chart conversion
    you will see this character is actually stored as 57 in binary. I think this is the correct explanation?

  5. #5
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: divisibility

    Quote Originally Posted by Shaybay92 View Post
    Why didn't they use 0 - 9 ASCII for the numbers 0 - 9? Seems unnecessarily confusing to me!
    Because it's an arbitrary relationship and doesn't actually mean anything. So no matter how you organize it, you're going to have a part of it that doesn't make sense to certain people.

    See also: List of Unicode characters - Wikipedia, the free encyclopedia
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