Java Program to find sum of digits with and without using recursion.

Java Program to find sum of digits without using recursion.

package javaprgms;

import java.util.Scanner;

public class SumOfDigits {

            public static void main(String[] args) {

                        int number;

                        @SuppressWarnings("resource")

                        Scanner in = new Scanner(System.in);

                        System.out.println("Please Enter a number");

                        number=in.nextInt();

                        int sum=0 ;

                        while(number!=0){

                                    sum=sum+(number%10);

                                    number=number/10;

                        }

                        System.out.println("Sum of Digits ="+sum);

            }

}

Output:

Please Enter a number

231

Sum of Digits =6 

Java Program to find sum of digits using recursion.

package javaprgms;

import java.util.Scanner;

public class sd {

            int sum;

            public int CalRecSum(int n){

                        if(n==0){

                                    return sum;

                        }

                        else{

                                    sum+=n%10;

                                    CalRecSum(n/10);

                        }

                        return sum;

            }

            public static void main(String[] args) {

                        int number;

                        Scanner in = new Scanner(System.in);

                        System.out.println("Please Enter a number");

                        number=in.nextInt();

                        sd   ob= new sd();

                        System.out.println("Sum of Digits ="+ob.CalRecSum(number));

            }

}

Output:

Please Enter a number

342435

Sum of Digits =21