Question

Write a Method to calculate and return the sum of the square of the digits of a number
'n' using recursive technique.
The method declaration is as follows:
int sumSq(int n)​

Answer 1

Method to calculate and return the sum of the square of the digits of a number  'n' using recursive technique.

Explanation:

• The method  is similar to a function in object-oriented programming to which parameters are passed and the operation is [performed and the result is returned.
• A class can have any number of methods.
• The method can only the data known to its object.
• In this method, the number is passed as in input through the variable n.
• If the number is a single digit, it is squared and returned directly.
• If the number has more than one digit, then modulo operation is performed to separate the digits and then it is squared.

public  static int int sumSq(int n)​

{

if (n < 10) return n^2;

return (((n % 10)^2) +sumSq(n/10));

}

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Answer 2

import java.util.*;

public class recursive

{

   int SumSq(int n)

   {

     if(n<10)

     {

     return n*n;

     }

     else

     {

         

      return(((n%10)*(n%10))+SumSq(n/10));

     }

   }

   public static void main(String args[])

   {

       recursive obj = new recursive();

       Scanner in = new Scanner(System.in);

       System.out.println("enter the number");

       int number = in.nextInt();

       int ans = obj.SumSq(number);

       System.out.println(ans);

   }

}