Java Concatenation

[jgargac]

Hi all,

I need to be able to enter a five digit number into my java app and then split each digit apart so that I can compare them to see if they are equal.

Ex) Enter 52125 and then compare the first and last numbers and the second and fourth numbers for equality. I'm having trouble splitting the number apart. Here's what I have so far:

package ex424;

import javax.swing.*;

public class ex424 {
public static void main( String args[] )
{
String firstNumber;
int number,
digit1,
digit2,
digit3,
digit4,
digit5;

firstNumber =
JOptionPane.showInputDialog( "Enter number" );

number = Integer.parseInt( firstNumber );

digit1 = number % 10000;
digit2 = number % 10000 % 1000;
digit3 = number % 10000 % 1000 % 100;
digit4 = number % 10000 % 1000 % 100 % 10;
digit5 = number % 10000 % 1000 % 100 % 10 % 1;

JOptionPane.showMessageDialog( null,
"Results" + (digit1), "Results",
JOptionPane.INFORMATION_MESSAGE );

System.exit ( 0 );
}
}

When I run this though, digit1 = whatever I enter minus the first number. What I want is the first number minus the rest of the number. Does anyone know where I've gone wrong. Thanks,

Jeff

[jkrohn]

x % y gives the remainder
so
digit 1 = 2125 52125 / 10000 = 5 r2125
digit 2 = 125
digit 3 = 25
digit 4 = 5
digit 5 = 0

Jkrohn

[jgargac]

Thanks Jkrohn,

That makes sense now. Do you know what code I would use to strip the digits out of the main number? I need to split the main number into 5 digits.

Ex) 12345 = 1 2 3 4 5

Thanks,

Jeff

[jkrohn]

digit1 = (number - (number % 10000)) / 10000
digit2 = ((number % 10000) - (number %10000%1000)) / 1000
digit3 = ((number % 1000) - (number %1000%100)) / 100
digit4 = ((number % 100) - (number %100%10)) / 10
digit5 = (number % 10)

52125 = number
digit1 = (52125 - 2125) / 10000 = 50000 / 10000 = 5
digit2 = (2125 - 125) / 1000 = 2000 / 1000 = 2
etc, etc

Another easier method is to to take it in as a string and cast it to an int piece by piece

Jkrohn

[zskillz]

essentially you're looking to see if you have a palindrome.. correct?

anyway... i would cast it to a string, then use the method

toCharArray() [look in string class for documentation]

then you can just traverse the array forwards and back in a simple for loop to compare the values!

int i,j;
for (i=0,j=data.length();i=j;i++,j--)
...compare the boxes
...break if they aren't the same


something along those lines is what i think would work!

good luck
-Z

[jgargac]

jkrohn,

that was the exact code that I needed. Thanks a million. Everything works out perfectly.

zskillz,

Yeah, I was checking to see if they were a palindrome.

Thanks guys for the help.

Jeff