Function to add the digits of a number

Create a C# program that asks the user for a number and save it in a text string. You must implement a function called AddDigits that receives the text as a parameter and returns the sum of its digits.

Input

2222222222222222222222

Output

44

Solution

using System;
public class FunctionAddDigitsNumber
{
    public static void Main(string[] args)
    {
        string number = Console.ReadLine();
        Console.WriteLine(number);
    }

    public static int AddDigits(string number)
    {
        int sum = 0;

        for (int i = 0; i < number.Length; i++)
        { 
            sum += Convert.ToInt32(number.Substring(i, 1));
        }

        return sum;
    }
}