divisibility

**droidus** · November 7th, 2011, 01:42 PM

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));
	}
 
}

**KevinWorkman** · November 7th, 2011, 02:49 PM

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.

**Junky** · November 8th, 2011, 09:34 PM

Originally Posted by droidus

(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);

**Shaybay92** · November 11th, 2011, 03:47 AM

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?

**KevinWorkman** · November 12th, 2011, 11:34 AM

Originally Posted by Shaybay92

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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