Separating the Digits in an Integer

[Mike Atoms]

I am newbie taking first class in JAVA. Can someone help get me started. I need to write an app that allows user to input five digit integer. Then the app must split the integers into there individual digits separted by three spaces using say a print method. Please help!!!

[David Newton]

What do you have so far?

[Mike Atoms]

package splitdigits;
import java.util.Scanner;

public class SplitDigits {

    public static void main(String[] args) {
        // Create scanner toobtain input from command window
        Scanner input = new Scanner(System.in);
        int Number; //User input number

        System.out.print( "Enter Five Digit Integer:");//Prompt
        Number= input.nextInt(5);//read integer from user
        
        Number/10000
        // ...

I know that I need to first check that the user inputs a five digit integer and then I need to divide the integer by 10000 in the first step to strip off the digit and then use the mod to keep the remainder and then divide that by 1000 so on and so forth. The syntax is still confusing to me.

[David Newton]

Please UseCodeTags. Unformatted code/config/etc. is difficult to read. You can edit your post to include them using the button or re-post the question with proper formatting.

(I've edited your post this time.)

[Mike Atoms]

Thanks for the repost, I won't make the mistake again. I am a newbie!

[Mike Atoms]

package splitdigits;
import java.util.Scanner;

public class SplitDigits {

 
    public static void main(String[] args) {
        // Create scanner to obtain input from command window
        Scanner input = new Scanner(System.in);
        int Number; //User input number

        System.out.print( "Enter Five Digit Integer:");//Prompt
        Number = input.nextInt(5);//read integer from user

        int Remainder4 = Number % 10000;
        
        int Remainder3 = Remainder4 % 1000;

        int Remainder2 = Remainder3 % 100;

        int Remainder1 = Remainder2 % 10;

        int Remainder0 = Remainder1 / 1; 

Here's what I've come up with so far. I now need to print each digit separated by three spaces. Please assist.

Thanks

[David Newton]

You already know how to print--give it a shot.

[Mike Atoms]

 System.out.printf("%d/",   "%d/",   "%d/",   "%d/",   "%d/", Remainder4, Remainder3, Remainder2, Remainder1, Remainder0);   

Here's what I tried but I get this error:

"Exception in thread "main" java.util.InputMismatchException: For input string: "12345"
at java.util.Scanner.nextInt(Scanner.java:2097)
at splitdigits.SplitDigits.main(SplitDigits.java:21)
Java Result: 1"

Is this from before I try to print?

[Kabir Shah]

@Mike
I think you have tried the program and hence i give you solution.

 Solution Hidden 

[Steve Luke]

Hi Gurudas, I removed the solution to this problem because I don't think we should just post solutions to homework problems, it doesn't really help the OP, and it won't help other people searching the topic either.


Mike,
You get the error:

"Exception in thread "main" java.util.InputMismatchException: For input string: "12345"
at java.util.Scanner.nextInt(Scanner.java:2097)
at splitdigits.SplitDigits.main(SplitDigits.java:21)

The exception tells you at what line in your code the error happens:
"at splitdigits.SplitDigits.main(SplitDigits.java:21) "
If you look in your code line 21 will be this:

        Number = input.nextInt(5);//read integer from user

I looked up the Scanner API for the nextInt method: Scanner#nextInt(int), and to paraphrase one of my favorite movies 'I do not think it does what you think it does.' The integer you pass in to nextInt is the 'radix', or the range of values for a single digit. When you pass in a radix of 5 you are saying each digit can hold a 0, 1, 2, 3, or 4 (one of 5 different values). You don't want to use that. You just want to use the normal nextInt method without the parameter:

        Number = input.nextInt();//read integer from user

You have some other compiler problems, noticeably next would be that your System.out.printf() statement is not correct. I will let you see if you can find the problem.

[Mike Atoms]

Thanks for the code: The only thing I noticed was that it needs to return the numbers in order from left to right. I managed to finally get this to work. The code is much longer than it probably needs to be. If anyone wants to try and clean it up some I would like to see how it might be done!

public class SplitDigits{
    public static void main(String args[])
    {// To print digits.
        Scanner read=new Scanner(System.in);
        System.out.println("Enter 5 digit number:");
        int n=read.nextInt();//read integer from user

        int Five = n/10000;

        int Remainder4 = n%10000;

        int Four = Remainder4/1000;

        int Remainder3 = Remainder4 % 1000;

        int Three = Remainder3/100;

        int Remainder2 = Remainder3 % 100;

        int Two = Remainder2/10;

        int Remainder1 = Remainder2 % 10;

        int One = Remainder1/10;

        int Remainder0 = Remainder1 / 1;

        int Zero = Remainder0;

        System.out.printf("%d   %d   %d   %d   %d   ",Five, Four, Three, Two, Zero);


        
    }//Closes Method

}//Closes class
    

[Steve Luke]

I have a suggestion (more like observation) for you:

        int Remainder1 = Remainder2 % 10;
        int One = Remainder1/10;
        int Remainder0 = Remainder1 / 1;
        int Zero = Remainder0;

Remainder1 gives you the values left over which are less than 10.

One is that value divided by 10, which would be a fraction and result in 0. This isn't what you want, which is why you don't use it.

Remainder0 is Remainder1 divided by 1, which is a non-operation.

Zero us just another variable/assignment.

You can probably clean the last 4 lines of code by replacing it all with:

        int Zero = Remainder2 % 10;

[Nitish Bangera]

I think using regex will be helpful and the code will be shorter.

  Scanner sc=new Scanner(System.in).useDelimiter("");
    System.out.print("Enter 5 digit number : ");
    while (sc.hasNextInt()){
        System.out.println(">"+sc.nextInt()+"<");
    }  

I guess the spacings you can do it using the printf method or the format method or even the print method.

[Sridhar Santhanakrishnan]

Maybe something similar to this

 while(num>0){
         System.out.println(num%10);
         num=num/10;
         
      }    

[Faucillon Flament]

Even though this seems an old topic I got the same assignment and took care of it this way.
(I won't be posting the entire code, just my methodology, in order to not ruin the excercise for future students.)

My method: Manually split the number by dividing it by powers of 10, (starting from the highest power of 10) and deduct that number from the integer before repeating the same method all the way down to 5 separate numbers
Advantage: more compact code, less variables to declare
Disadvantage: not a scalable solution (if you were to get the same assignment but instead with an integer existing of a thousand numbers this code would become unreadable)
[Extra note: the method is scalable however if you write it recursively. Because recursive coding is something I think someone struggling with this assignment will not have grasped yet, I did not include it in this post.]

num5 = n/10000;
num4 = (n-num5*10000)/1000;
num3 = (n-(num5*10000+num4*1000))/100;
num2 = (n-(num5*10000+num4*1000+num3*100))/10;
num1 = (n-(num5*10000+num4*1000+num3*100 + num2*10));
System.out.printf("%4d%4d%4d%4d%4d",num5, num4, num3, num2, num1);

e.g.
1) num5 = 12345/10000 = 1
2) num4 = (12345-1*10000)/1000 = 2345/1000 = 2
3) num3 = (12345-(1*10000+2*1000))/100 = 345/100 = 3
4) num2 = (12345-(1*10000+2*1000+3*100))/10 = 45/10 = 4
5) num1 = (12345-(1*10000+2*1000+3*100+4*10)) = 5

(Obviously the last number does not need to be divided by a power of 10 because it is always a number smaller than 10.)

Hope this helps.
Greetz,
Faucillon

[Campbell Ritchie]

Welcome to the Ranch

I would prefer a method with a loop, because it would be scalable.