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Accept a number on the command line and display whether it is a strong number. 

using System;

namespace st
{
    class StrongNumber
    {
        public static void Main(string[] args)
        {

            int num = Int32.Parse(args[0]);

            int orgnum = num;
            int total = 0;

            while (num != 0)
            {
                // take a digit 
                int digit = num % 10;
                
                int factorial = 1;
                for (int i = 1; i <= digit; i++)
                       factorial *= i;

                total += factorial;

                // remove digit 
                num /= 10;
            }

            if (total == orgnum)
                Console.WriteLine("{0} is a strong number", orgnum);
            else
                Console.WriteLine("{0} is not a strong number", orgnum);
        } // main
    } // class
} // st

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