Separating the Digits in an Integer - exercise from Deitel's Java book

Question

Exercise from Deitel\'s \"Java How To Program\" 10th edition:

2.30 (Separating the Digits in an Integer) Write an application that inputs one number c

Answer 1

Here is the answer of displaying digit in same order u have enter

import java.util.Scanner;

public class oddMethod {
    public static void main(String[] args) {
        System.out.println("Enter start number:");
        int number=getNumber();
        int last=Reverse1stTime(number);
        System.out.println("Digit You Enter:"+last);
    }

    private static int getNumber() {
        Scanner sr = new Scanner(System.in);
        return sr.nextInt();
    }
    private static int Reverse1stTime(int number)
    { int  digit=0;
    int reverse=0;
        while(number>0)
        {
            digit=number%10;
            reverse=reverse*10+digit;
            number=number/10;
        }
       return reverseAgain(reverse);
    }
    private static int reverseAgain(int number)
    { int  digit=0;
        int reverse=0;
        while(number>0)
        {
            digit=number%10;
            System.out.println(digit);

            reverse=(reverse*10+digit);
            number=number/10;
        }
        return reverse;
    }
}
Input 12345
Output 12345

Answer 2

package chapter1;

import java.util.Scanner;

public class Exercise3 {

    public static void main (String[] args){
    Scanner scan = new Scanner (System.in);
    System.out.print ("Enter a number that consist of 5 digits: ");
    int num =scan.nextInt();

    int digit1 =num / 10000;
    int digit2 =(( num % 10000) / 1000 );  // the modulus answer of num/10000 is divided by 1000
    int digit3 =( ( num % 1000) / 100 );
    int digit4 = ( ( num% 100 ) / 10 );
    int digit5 = ( num % 10);

    System.out.print (digit1+"\t");
    System.out.print(digit2+"\t");
    System.out.print(digit3+"\t");
    System.out.print(digit4+"\t");
    System.out.println(digit5+"\t");
    }


}

Answer 3

my small hint with division - you can divide by 10 and take a look, what is that operation giving... More, you have to deduce if you want to learn programming.

Answer 4

import java.util.Scanner;  
public class DigitSeparator{  
    public static void main(String[] args){  
        Scanner input = new Scanner(System.in);  
        System.out.print("Enter a 5 digit number: ");  
        int number = input.nextInt();  

        System.out.print((number / 10000)+ "   ");   
        int divider = 10000;  
        int mod = number % 10000;  

        for(int i = 1; i <= 4; i++){  
            divider /= 10;  
            System.out.print( mod/divider +"   ");  
            mod %= divider;         
        }  
        System.out.println();  
    }  
}