Java/ApComputerSci., User input programs Options

[SkaironFrenzy]

{OK i'm pretty much new to Java and the computer language thing, but I do understand the fundamentals.}

Due:Wednesday, 21,2005

Problem:

Write an application program that inputs one number consisting of four digits from the user; separates the number into its individual digits and prints the separated digits from one another. For example, if the user types in the number 4239, the program should print 4 2 3 9.(hint:Use Mod(%) and Division(/).

Ok this is what I got so far:

import javax.swing.JOptionPane;

public class Separate
{
public static void main(String[] args)
{
String number;
int numberOne;
double mod;
double division;

number=JOptionPane.showInputDialog("Enter 4 numbers");
numberOne= Integer.parseInt(number);


System.exit(0);
}
}

(I tried putting a code box but it screwed up the code.)
Its just the foundation. I cant figure out the rest to separate the numbers. Thanks you all for your help.

[*mipadi*]

Okay, well, I didn't feel like building an interface to test this, but I built it as a command-line applet. Here's what I did:

CODE

public class SplitNum
{
   public static void main(String[] args)
   {
       TextReader keyboard = new TextReader(); //this is just a class i built for easily getting keyboard input

       System.out.print("Enter number: ");
       int num = keyboard.readInt();

       String num_string = new String();
       num_string = num_string.valueOf(num); //read number as a string

       int i = 0;
       for (i = 0; i < num_string.length(); i++) {
           System.out.print(num_string.charAt(i) + " "); //output specific character of string
       }
       System.out.println();
   }
}

Here's what the output looks like:

CODE

athena{~/csci203/practice}% java SplitNum
Enter number: 4329
4 3 2 9

It shouldn't be too hard to convert it into a Swing applet.

It doesn't use division or mod, but hey, it works fine.

[SkaironFrenzy]

hmm. thats nice. thank you.but there is no other way than that? If there is, I want something that strictly uses Division and Mod (at least that what my teacher says).

But other than that, you must be good at these stuff! I'm so jealous Someday...Someday

[*mipadi*]

Okay. Well, here's a rough algorithm you could work with:

CODE

4239

1. Divide by 1000                .4239
2. Multiply by 10                4.239
3. Truncate                      4
4. Multiply old value by 1000    239
5. Divide by 100                 2.39
6. Truncate                      2
7. Multiply old value by 100     39
8. Divide by 10                  3.9
9. Truncate                      3
10. Multiply old value by 10     9

Edit
Okay...here's a program I whipped up really quickly that should work:

CODE

public class SplitNum2
{
   public static void main(String[] args)
   {
       TextReader keyboard = new TextReader();

       System.out.print("Enter number: ");
       int num = keyboard.readInt();

       double tmp;
       int thousands, hundreds, tens, ones;
       tmp = num / 1000.0;
       tmp = tmp * 10.0;
       thousands = (int) tmp;
       tmp = tmp * 1000.0;
       tmp = tmp / 100.0;
       hundreds = (int) tmp;
       tmp = tmp * 100.0;
       tmp = tmp / 10.0;
       tens = (int) tmp;
       tmp = tmp * 10.0;
       ones = (int) tmp;

       System.out.println(thousands + " " + hundreds + " " + tens + " " + ones);
   }
}

It's probably not necessary to copy num into tmp, but I didn't know if I'd want to use num later (I ended up not using it) so I wanted to retain a copy of the original number.

Also, again, this is a command-line applet, but you can just convert it for use in something with a Swing interface.

The algorithm is noted above, and the implementation here; if you have any additional questions about how the program functions, feel free to ask.

Also, the program isn't optimized; for instance, in the algorithm, lines 4 and 5 call for multiplying by 1000 and dividing by 100; clearly they could be combined into one line and just multiply the old value by 10. Doing this could probably allow you to put everything into a loop, so it could handle numbers bigger or smaller than 4 digits (but since you know you are inputting a 4 digit number, this application will work in this instance). Again, if you really want to impress your teacher, you should probably go through and optimize the code I demonstrated. But that's something you can fix on your own.

This post has been edited by mipadi: Sep 15 2005, 10:23 PM

[SkaironFrenzy]

lol. thanks -ALOT. i pretty much get it now.

EDIT
u know that 4239/1000 is not ".4239" its "4.239.

EDIT(again)
OK some can close this now. I figured it out! yay! But it was mostly from your help. Thanks though. This is what I got.

CODE

import javax.swing.JOptionPane;

public class Split
{
    public static void main(String[] args)
    {
 String number;
 double numberOne;

 int thousands;
 double numberTwo;
 double numberThree;  
   
 int hundreds;
 double numberFour;
 double numberFive;
 
 int tens;
 double numberSix;
 double numberSeven;
 
 int ones;
 double numberEight;
 double numberNine;
 
 number=JOptionPane.showInputDialog("Enter a four digit number");
 numberOne= Integer.parseInt(number);
 numberTwo=numberOne%10000.0;
 numberThree=numberTwo/1000.0;  
 thousands=(int)numberThree;
 
 numberFour=numberOne%1000.0;
 numberFive=numberFour/100.0;
 hundreds=(int)numberFive;
 
 
 numberSix=numberOne%100.0;
 numberSeven=numberSix/10.0;
 tens=(int)numberSeven;    
 
 numberEight=numberOne%10.0;
 numberNine=numberEight/1.0;
 ones=(int)numberNine;
 
 System.out.println("Here you go!\n"+thousands+" "+hundreds+" "+tens+" "+ones);
 
 System.exit(0);
    }
}  

so yea someone can close this now.

[*mzkandi*]

^ Ok.

Topic Closed.