Java/src/main/java/com/thealgorithms/maths/HarshadNumber.java at master · tyb/Java · GitHub

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// Wikipedia for Harshad Number : https://en.wikipedia.org/wiki/Harshad_number

package com.thealgorithms.maths;

import java.util.Scanner;

public class HarshadNumber {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

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

long a = sc.nextLong();

checkHarshadNumber(a);

}

/**

* A function to check if a number is Harshad number or not

* @param a The number which should be checked

public static void checkHarshadNumber(long a) {

long b = a;

int sum = 0;

// this is just for showing the explanation else it's of no use you can ommit it

int[] each = new int[Long.toString(a).length()];

int c = 0;

while (b > 0) {

sum += b % 10;

each[c] = (int) (b % 10);

b /= 10;

c++;

}

if (a % sum == 0) {

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

// For you better explanation how is that a Harshad Number

System.out.println("\nExplaination :");

for (int i = each.length - 1; i >= 0; i--) {

System.out.print(each[i] + " ");

if (i != 0) {

System.out.print("+ ");

}

System.out.println("= " + sum);

System.out.println(sum + " × " + (a / sum) + " = " + a);

} else {

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

}

Java/src/main/java/com/thealgorithms/maths/HarshadNumber.java at master · tyb/Java · GitHub

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