BlueJ Program To Print Fascinating Numbers

   Fascinating Numbers : Some numbers of 3 digits or more exhibit a very interesting property. The property is such that, when the number is multiplied by 2 and 3, and both these products are concatenated with the original number, all digits from 1 to 9 are present exactly once, regardless of the number of zeroes.
  Some examples of fascinating Numbers are: 192, 219, 273, 327, 1902, 1920, 2019 etc.


 import java.util.*;
class Str3
{
   Scanner sc=new Scanner(System.in);
    void main()
    {
       int a,b,i,n;
       System.out.print("\nEnter any number: ");
       n=sc.nextInt();
       a=n*3;
       b=n*2;
       String s0=Integer.toString(n);
       String s1=Integer.toString(a);
       String s2=Integer.toString(b);
       String s=s0+s1+s2;
       if(s.length()!=9)
       {
           System.out.println("Not a fascinating no.");
           System.exit(0);
       }
       int c[]=new int[10];
       for(i=0;i<9;i++)
       {
           int ch=s.charAt(i);
           int x=Character.getNumericValue(ch);
           c[x]++;
       }
       for(i=1;i<9;i++)
       {
           if(c[i]!=1)
           break;
       }
       if(i==9)
       System.out.println("Fascinating no.");
       else
       System.out.println("Not a fascinating no.");
    }
    public static void main(String args[])
    {
        Str3 ob=new Str3();
        ob.main();
    }
}       
  

Other Programs On Numbers: CLICK HERE