# 1. Introduction

Finding the sum of digits of a number is a common programming task. For instance, if we have the number 123, the sum of its digits is 1 + 2 + 3 = 6. This blog post presents a Scala program that calculates the sum of the digits of a given number.

# 2. Program Steps

1. Set up the Scala environment.

2. Create an object to house the main function.

3. Define the number whose digits' sum needs to be found.

4. Implement a function to compute the sum of the digits.

5. Call the sum-calculation function and display the result.

6. Run the program.

# 3. Code Program

```
object DigitSumApp {
def main(args: Array[String]): Unit = {
// Define the number
val num = 12345
println(s"Finding the sum of digits of the number: $num")
// Calculate and print the sum using the sumOfDigits function
val result = sumOfDigits(num)
println(s"\nThe sum of digits of $num is: $result")
}
// Function to determine the sum of digits of a number
def sumOfDigits(n: Int): Int = {
if (n == 0) 0 else n % 10 + sumOfDigits(n / 10)
}
}
```

### Output:

Finding the sum of digits of the number: 12345 The sum of digits of 12345 is: 15

### Explanation:

1. We start with an object named *DigitSumApp*. In Scala, the *main* method, which is the program's entry point, is housed within an object.

2. Within the *main* function, we declare a value *num* representing the number for which we want to find the sum of digits.

3. We inform the user about the number being processed.

4. The *sumOfDigits* function calculates the sum of digits of the given number. This is done recursively: at each step, the last digit is added (*n % 10*), and the function is called again with the number excluding its last digit (*n / 10*).

5. The *main* function invokes the *sumOfDigits* function to get the sum of digits and subsequently displays the result.

6. The output section displays the number being processed and its sum of digits.

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