Problem: 4.10

 

Question 4.10:  Write a program in Java to check armstrong and perfect numbers using the function.
Test Data :
Input any number: 371
Expected Output :
The 371 is an Armstrong number.
The 371 is not a Perfect number.

Solution:

package lab4problem10;

import java.util.Scanner;

public class Lab4Problem10 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        System.out.print("Input any number: ");

        int number = input.nextInt();

        checkArmstrong(number);

        checkPerfect(number);

    }

    static void checkArmstrong(int j) {

        int a = 0, k = 0, e = j;

        for (; j % 10 != 0; ) {

            a = j % 10;

            k = k + (a * a * a);

            j = j / 10;

        }

        if (k == e) {

            System.out.println("The " + e + " is an Armstrong number.");

        } else {

            System.out.println("The " + e + " is not an Armstrong number.");

        }

    }

    static void checkPerfect(int i) {

        int k = 0, m = 0;

        for (k = 1;k <= i/2; k++) {

            if (i % k == 0) {

                m = m + k;

            }

        }

        if (m == i) {

            System.out.println("The " + i + " is a Perfect number.");

        } else {

            System.out.println("The " + i + " is not a Perfect number.");

        }

    }

}