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Swift program to calculate the sum of all digits using recursion

Here, we are going to learn how to calculate the sum of all digits using recursion in Swift programming language?
Submitted by Nidhi, on June 25, 2021

Problem Solution:

Here, we will create a recursive function to calculate the sum of all digits of a specified number and print the result on the console screen.

Program/Source Code:

The source code to calculate the sum of all digits using recursion is given below. The given program is compiled and executed successfully.

// Swift program to calculate the
// sum of all digits using recursion

import Swift

var sum:Int = 0

func SumOfDigits(number:Int)->Int {
    if number > 0 {
        sum += (number % 10)
        return SumOfDigits(number:number / 10)
    }

    return sum
}

var result = SumOfDigits(number:1234)

print("Sum of all digits is: ",result)

Output:

Sum of all digits is:  10

...Program finished with exit code 0
Press ENTER to exit console.

Explanation:

In the above program, we imported a package Swift to use the print() function using the below statement,

import Swift;

Here, we created a global variable sum and recursive function SumOfDigits() to calculate the sum of all digits and printed the result on the console screen.