using System;

namespace ArithmaticOperations

{

public class Swapping{

    int f=1,number;

    public void Add()

    {

        Console.Write("Enter any nuber");

         number=int.Parse(Console.ReadLine());

        for(int i=1;i<=number;i++)

        {

        f=f*i;

        }

      Console.WriteLine("Your input: {0}",f);

    }

​

}

    public class ArrayMain

    {

    public static void Main()

    {

        Swapping s= new Swapping();

        s.Add();

    }

    }

​

}

​

​