Question

Write a program to input a number check and display whether it is a Niven number or not Example – sample input 126
Sum of its digits = 1 + 2 +6 =9 and 126 is divisible by 9

Answer 1

Answer:

Harshad (Or Niven) Number

• An integer number in base 10 which is divisible by sum of it digits is said to be a Harshad Number. An n-harshad number is an integer number divisible by sum of its digit in base n.

• Below are first few Harshad Numbers represented in base 10:

• 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 18, 20………

• Given a number in base 10, our task is to check if it is a Harshad Number or not.

Answer 2

Question:

Write a program to input an integer and check whether it is Harshad or Niven number or not. A number is said to be Harshad if it is divisible by the sum of the digits of that number, example 126 and 1729.

Solution:

Language used: Java

import java.util.*;

public class NivenNo

{

static void main()

{

Scanner sc=new Scanner(System.in);

int d,s=0,n,t;

System.out.println("Enter an integer:");

n=sc.nextInt();

t=n;

while(t!=0)

{

d=t%10;

s=s+d;

t=t/10;

}

if(n%s==0)

System.out.println("Harshad Number");

else

System.out.println("Not a Harshad Number");

}

}