Sum the digits of an integer.

[MaryEllen Volb]

I have already gotten one good response to this one, but now I can't understand how to extract the digits so I can sum them together (2 + 3 + 4 =9). Anyone got any great idea?
Here's the code I already got:
public class Test{
public static void main(String[] args){
int i = 234;
sumDigits(i);}
private static void sumDigits(int digits){System.out.println("digits before calculation: " + digits);int sum = 0;
sum += digits % 10;
digits /= 10;
System.out.println("sum: " + sum);System.out.println("digits after calculation: " + digits);
}} Thanks!!!Mary Ellen

[huiying li]

public class Test
{ 
    public static void main(String[] args) 
    { 
        int i = 234; 
        sumDigits(i); 
    } 
    private static void sumDigits(int digits) 
    { 
        System.out.println("digits before calculation: " + digits); 
        int sum = 0; 
        while ( digits > 0 )
        {
            sum += digits % 10; 
            digits /= 10; 
            System.out.println("sum: " + sum); 
            System.out.println("digits after calculation: " + digits);
        } 
    }
} 

[MaryEllen Volb]

Thanks....I'll try it!!! Mary Ellen

[Pat Barrett]

Hello,
The first thing is to separate the digits. If you take a 3 digit number and divide by 100, your answer will be a single digit representing the hundreds place. Now, if you take that same 3 digit number and get the modulus of a division by 100, you will be left with the tens and units places, represented as a 2 digit number. Take that 2 digit number, divide by ten and you'll have the 10's place, the modulus of the 2 digit number divided by 10 will be the units place.
Let's try 123..
123 / 100 = 1 ( the hundreds place )
123 % 100 = 23 ( the remainder )
23 / 10 = 2 ( the tens place )
23 % 10 = 3 ( the units place )
Sum up the hundreds, tens & units and you'll have your answer.
or.....

public class Test
{     
    public static void main(String[] args)
    {
         int i = 234;
         sumDigits(i);
    }
    private static void sumDigits(int digits)
    {
         System.out.println("digits before calculation: " + digits);
         int hund = digits / 100 ;
         int remainder = digits % 100 ;
         int tens = remainder / 10 ;
         int units = remainder % 10 ;
         System.out.println("digits after calculation: " + ( hund + tens + units ) );
     }
} 

hth.
Pat B.

[MaryEllen Volb]

Yes, it did help so much.....thanks....I wouldn't be getting thru my class if not for all the help I find here!!!

Mary Ellen