a
K
```// Wikipedia for Harshad Number : https://en.wikipedia.org/wiki/Harshad_number
package com.thealgorithms.maths;

import java.util.Scanner;

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter a number : ");
long a = sc.nextLong();

}

/**
* 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");
}
}
}
```