sum of number in c#

Sum of number 

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

namespace Programone
{
    class Program
    {  
        static void Main(string[] args)
        {
            int num1, sum=0, temp;
            Console.WriteLine("Enter number");
            num1 = int.Parse(Console.ReadLine());

            while (num1 != 0)
            {
                temp = num1 % 10;
                num1 = num1 / 10;
                sum = sum + temp;
            }
            Console.WriteLine(sum);
     
            Console.ReadLine();      

        }
    }
}

reverse of number 

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

namespace Programone
{
    class Program
    {       
        static void Main(string[] args)
        {
            int num1, Rev=0;
            Console.WriteLine("Enter number");
            num1 = int.Parse(Console.ReadLine());

            while (num1 != 0)
            {
                Rev = Rev * 10;                
                Rev = Rev+num1 %10;
                num1 = num1 / 10;
                
            }
            Console.WriteLine(Rev);
           
            Console.ReadLine();           

        }
    }
}



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