Java Program to find Sum of Digits

Posted in Java Tutorial

Updated on Jan 11, 2024

By Mari Selvan

👁️ 83 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In the realm of programming, manipulating and extracting information from numbers is a common task. One such operation is finding the sum of the digits of a given number. This involves breaking down the number into its individual digits and adding them together.

In this tutorial, we will explore a Java program designed to find the sum of the digits of a given number.

📄 Example

Let's delve into the Java code that accomplishes this task.

SumOfDigits.java

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import java.util.Scanner;

public class SumOfDigits {
  // Function to find the sum of digits of a number
  static int sumOfDigits(int number) {
    int sum = 0, digit;

    // Iterate through each digit of the number
    while (number != 0) {
      // Extract the last digit
      digit = number % 10;
      // Add the digit to the sum
      sum += digit;
      // Remove the last digit from the number
      number /= 10;
    }

    return sum;
  }

  // Driver program
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);

    // Replace this value with the number you want to find the sum of digits for
    System.out.print("Enter a number: ");
    int number = scanner.nextInt();

    // Call the function to find the sum of digits
    int result = sumOfDigits(number);

    // Print the result
    System.out.println("The sum of digits of " + number + " is: " + result);

    scanner.close();
  }
}

💻 Testing the Program

To test the program with different numbers, replace the value of number in the code or enter a number when prompted.

Output

The sum of digits of 12345 is: 15

Compile and run the program to find the sum of digits for the specified number.

🧠 How the Program Works

The program defines a class SumOfDigits containing a static method sumOfDigits that takes an integer number as input and returns the sum of its digits.
Inside the method, it uses a while loop to iterate through each digit of the number.
It extracts the last digit, adds it to the sum, and removes the last digit from the number.
Inside the main program, replace the value of number with the desired number you want to find the sum of digits for.
The program calls the sumOfDigits method and prints the result.

🧐 Understanding the Concept of Sum of Digits

Before delving into the code, let's understand the concept of finding the sum of digits. It involves breaking down a number into its individual digits and adding them together.