Sum of Digits of a Number in Java Program

program to print the sum of all the digits of a given number in Java. We will find the sum of digits of a number in Java using for loop. The while loop also can be used for this purpose. We can also develop a Java program to calculate the sum of digits without using any loop.

Sum of Digits of a Number in Java Language

Table of Contents

Using while loop
import java.util.Scanner;

public class SumOfDigitsProgram {

   public static int digitSum(int number) {
      // declare variables
      int lastDigit = 0;
      int sum = 0;

      // loop to repeat the process
      while(number != 0) {

         // find last digit
         lastDigit = number % 10;

         // add last digit to sum
         sum = sum + lastDigit;

         // remove last digit
         number = number / 10;
      }

      // sum value is the sum of digits
      // of the given number
      return sum;
  }

  public static void main(String[] args) {
      // declare variables
      int number = 0;
      int sumOfDigits = 0;

      // create Scanner class object 
      // for reading the values
      Scanner scan =  new Scanner(System.in);

      // read input
      System.out.print("Enter an integer number::");
      number = scan.nextInt();

      // find sum of digits of number
      sumOfDigits = digitSum(number);

      // display result
      System.out.println("The sum of digits of" +
         " the number "+number+" = "+sumOfDigits);

      // close Scanner class object
      scan.close();
  }
}

The output for the different test-cases are:-



Enter an integer number:: 12345
The sum of digits of the number 12345 = 15

Enter an integer number:: 95423
The sum of digits of the number 95423 = 23

Types of Sorting Algorithms:

Additional Reading

If you found this post useful, don’t forget to share this with your friends, and if you have any query feel free to comment it in the comment section.
Thank you 😊 Keep Learning !