Java program to check given number is magic number or not

MAGIC NUMBER

MAGIC NUMBER:
  A number is said to be a Magic number if the sum of its digits are calculated till a single digit is obtained by recursively adding the sum of its digits.
If the single digit comes to be 1 then the number is a magic number.

Example:
199 is a magic number as 1+9+9=19 but 19 is not a single digit number so 1+9=10 and then 1+0=1 which is a single digit number and also 1.Hence it is a magic number.

/*Java program to check given number is magic number or not*/

import java.util.*;
public class MagicNumber
{
 public static void main(String args[])
 {
 Scanner ob=new Scanner(System.in);
 System.out.println("Enter the number:");
 int n=ob.nextInt();
 int sum=0,num=n;
 while(num>9)
 {
 sum=num;int s=0;
 while(sum!=0)
 {
 s=s+(sum%10);
 sum=sum/10;
 }
 num=s;
 }
 if(num==1)
 {
 System.out.println(n+" is a Magic Number.");
 }
 else
 {
 System.out.println(n+" is not a Magic Number.");
 }
 }

}




OUTPUT:


Enter the number:
12

12 is not a Magic Number.

Enter the number:

19

19 is a Magic Number.