Niven Number | Write a program in Java to check if the given number is NIven Number or not. | ISC Computer Science | ICSE Computer Application

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Harshad Number : In recreational mathematics, a Harshad number (or Niven number), is an integer (in base 10) that is divisible by the sum of its digits.
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Algorithm

  1.   Start 
  2. x:=0
  3. Print "Enter a number"
  4. Read x
  5. if x%step 6 ==0, go to step 15 or else go to step 16
  6. t=x. Go to step 7
  7. digit:=0. Go to step 8
  8. sum=0. Go to step 9
  9. if t>0, go to step 10 or else go to step 14
  10. digit=t%10. Go to step 11
  11. sum=sum+digit. Go to step 12.
  12. t=t/10. Go to step 13
  13. Go to step 9
  14. return sum 
  15. Print "The given number is Niven Number". Go to step 17
  16. Print "The given number is not Niven Number"
  17. Stop

Program

Buffered Reader

import java.io.*;
class Niven
{
    int x;
    
    void accept() throws IOException
    {
        BufferedReader br=new BufferedReader (new InputStreamReader (System.in));
        System.out.println("Enter a number");
        x=Integer.parseInt(br.readLine());
    }
    
    int sumOfDigits()
    {
        int t=x, digit, sum=0;
        while(t>0)
        {
            digit=t%10;
            sum=sum+digit;
            t=t/10;
        }
        return sum;
    }
    
    void isNiven()
    {
        if(x%sumOfDigits()==0)
        {
            System.out.println("The given number is Niven Number");
        }
        else
        {
            System.out.println("The given number is not a Niven Number");
        }
    }
    
    void main() throws IOException
    {
        accept();
        isNiven();
    }
}

Scanner

import java.util.*;
class Niven
{
    int x;
    
    void accept() 
    {
        Scanner sc=new Scanner(Sysem.in);
        System.out.println("Enter a number");
        x=sc.nextInt();
    }
    
    int sumOfDigits()
    {
        int t=x, digit, sum=0;
        while(t>0)
        {
            digit=t%10;
            sum=sum+digit;
            t=t/10;
        }
        return sum;
    }
    
    void isNiven()
    {
        if(x%sumOfDigits()==0)
        {
            System.out.println("The given number is Niven Number");
        }
        else
        {
            System.out.println("The given number is not a Niven Number");
        }
    }
    
    void main() 
    {
        accept();
        isNiven();
    }
}

Documentation

Variable Description

Data Type Variable NameDescription
 intx To store the number entered by the user.
 int tTo act as a temp variable 
 intdigit To store the digit of the number 
 intsum To store the sum of digits of the number 

Method Description

 Return TypeMethod NameDescription
 voidaccept() To accept data from the user. 
 intsumOfDigits() To calculate the sum of digits of the number. 
 voidisNiven() To check whether the given number is Niven or not. 
 voidmain() To act as  an entry gateway for the compiler.

Output


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