Special Number ISC Computer Science 2008 Theory

A special number is a number in which the sum of the factorial of each digit is equal to the number itself.

For example,
145 = 1! + 4! + 5! = 1 + 24 + 120 = 145.
Design a class Special to check if a given number is a special number. Some of the members of the class are given below:
Class name: Special
Data members/instance variables:
n: to store the integer
Member functions:
Special(): constructor to assign 0 to n.
Special(int): parameterized constructor to assign a value to n.
void isSpecial(): to check and display if the number 'n' is a special number.

import java.util.Scanner;

class Special{

    int n;

    public Special(){

        n = 0;

    }

    public Special(int num){

        n = num;

    }

    public void isSpecial(){

        int sum = 0;

        int f = 1;

        for(int i = n; i != 0; i /= 10){

            int d = i % 10;

            for(int j = 1; j <= d; j++)

                f *= j;

            sum += f;

            f = 1;

        }

        if(n == sum)

            System.out.println("Special number!");

        else

            System.out.println("Not a special number.");

    }

    public static void main(String args[]){

        Scanner in = new Scanner(System.in);

        System.out.print("Enter the number: ");

        int num = Integer.parseInt(in.nextLine());

        Special obj = new Special(num);

        obj.isSpecial();

    }

}