How can I separate the digits of an int number in Java

Question

If I have a number 2500, I want the output to be: 2, 5, 0, 0. How can I separate the numbers into digits?

Answer 1

We can easily separate the digits of an integer number using Java.

public static void main(String[] args) {

int num=1020; // int number


while (num > 0) {

    System.out.println( num % 10);

    num = num / 10;

}

}

Comments

Sir This One Is showing Reverse Of Input Numbers

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Yes @Faizan Ali this will give you the numbers in reverse order. You will need to push them onto a stack and pop them off in reverse order.

Code to print the numbers in the correct order:

int number; // = and int
LinkedList<Integer> stack = new LinkedList<Integer>();
while (number > 0) {
    stack.push( number % 10 );
    number = number / 10;
}

while (!stack.isEmpty()) {
    print(stack.pop());
}

Hope it works now!!

Thank you!!

Answer 2

You can convert a number into String and then you can use toCharArray()  or split() method to separate the number into digits.
 

String number = String.valueOf(someInt);

char[] digits1 = number.toCharArray();
// or:
String[] digits2 = number.split("(?<=.)");

Still unable to separate the digits, enroll now with one of the best Java certification course offered by Edureka.

Answer 3

import java.util.*;

public class AmstrongNumber {

public static void main(String args[])

{

int a,i,count=0;

Scanner s= new Scanner(System.in);

System.out.println("Enter a number");

a=s.nextInt();

   while (a > 0) {

i= a % 10;

System.out.println(i);

  a = a / 10;

}

   //System.out.println(a);

}

}

Comments

This will print the values in reverse order not the orignal one.

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you saved my life bro

Answer 4

Hey, Guys 

I have found a new solution to this existing is: 

toCharArray() to Get the Array of Characters. Another way of separating the digits from an int number is using the toCharArray() method. We will convert the integer number into a string and then use the string's toCharArray() to get the characters' array. Now we can print out all the characters one by one.

Answer 5

Hello guys,

The javaScript split method can be used to split numbers into arrays. But the split method only splits string, so first, you need to convert Number to String. Then you can use the split method with a combination of map method to transform each letter into a Number.

Answer 6

You can also have a look here:

To do this, you will use the % (mod) operator.

int number; // = some int

while (number > 0) {
    print( number % 10);
    number = number / 10;
}

The mod operator will give you the remainder of doing int division on a number.

So,

10012 % 10 = 2

Because:

10012 / 10 = 1001, remainder 2

Note: this will give you the numbers in reverse order. You will need to push them onto a stack and pop them off in reverse order.

Code to print the numbers in the correct order:

int number; // = and int
LinkedList<Integer> stack = new LinkedList<Integer>();
while (number > 0) {
    stack.push( number % 10 );
    number = number / 10;
}

while (!stack.isEmpty()) {
    print(stack.pop());
}