A Java Program to find the single digit sum of a number

This program can be used to find the single digit sum of the given number in java. In this post you can find recursive as well as iterative method. Unlike just finding the sum of digits in a given integer, if further finds the same until a single digit is achieved.

Screenshots [Demo]

The output of both Recursive and Iterative method are displayed above !

The Iterative Method:

import java.util.Scanner;
class SingleIte
{
 public static void main(String []as)
 {
  Scanner sc=new Scanner(System.in);
  int n,s=0,f=0;
  System.out.print("Enter The digit: ");
  n=sc.nextInt();
  while(f==0)
  {
   while(n>0)
   {
    s=s+(n%10);
    n=n/10;
   }
   if(s<10)
    f=1;
   else
   {
    n=s;
    s=0;
   }
  }
  System.out.println("The Sigle digit sum is: "+s);
 }
}

The Recursive Method:

import java.util.Scanner;
class SingleRec
{
 public static void singleSum(int n)
 {
  int s=0;
  while(n>0)
  {
   s=s+(n%10);
   n=n/10;
  }
  if(s<10)
   System.out.println("The Sigle digit sum is: "+s);
  else
   singleSum(s);
 }  
 public static void main(String []as)
 {
  Scanner sc=new Scanner(System.in);
  System.out.print("Enter The digit: ");
  singleSum(sc.nextInt());  
 }
}

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