Problem Name_single_digi, C#

Problem Name_single_digi

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            //Console.WriteLine("Hello, world!");
            // the prog is incomplete for 9223 it will return 16.
             int num, result;
            
            Console.WriteLine("Enter the Number : ");
            num = int.Parse(Console.ReadLine());
            result = sum(num);
            Console.WriteLine("Sum of Digits in {0} is {1}", num, result);
            Console.ReadLine();
        }
        
         public static int sum(int num)
        {
            if (num != 0)
            {
                return (num % 10 + sum(num / 10));
            }
            else
            {
                return 0;
            }
        }
    }
}


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