ISC Computer Science Theory Paper 2023 Program Dudeney Number

 

import java.util.Scanner;

public class Dudeney {

    public static void main(String[] args) {

        NumDude obj = new NumDude();

        obj.input();

        obj.isDude();

    }

}

class NumDude {

    public void isDude() {

        if (numb == (int) Math.pow(sumDigits(numb), 3)) {

            System.out.println(numb + " is a Dudeney Number");

        }else {

            System.out.println(numb + " is not a Dudeney Number");

        }

    }

    private int sumDigits(int x) {

        if (x > 10) {

            return ((x % 10) + sumDigits(x / 10));

        } else {

            return x;

        }

    }

    public void input() {

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter a positive integer: ");

        numb = scanner.nextInt();

        scanner.close();

    }

    public NumDude() {

        this.numb = 0;

    }

    private int numb;

}

🔢 Dudeney Number Checker

A Dudeney number is a positive integer that is a perfect cube such that the sum of its decimal digits equals the cube root of the number.

🎯 Examples:

• 1 = 1³ and 1 = 1
• 512 = 8³ and 5+1+2 = 8
• 4913 = 17³ and 4+9+1+3 = 17
• 5832 = 18³ and 5+8+3+2 = 18

Enter a positive integer:

Try numbers like: 1, 512, 4913, 5832, 17576, 19683