using System;

public class Program

{

    public static void Main()

    {

        int input = 12345;

        decimal output;

        Console.Write("decimal!: ");

        output = (decimal)Convert.ChangeType(input, typeof(decimal));

        Console.WriteLine(output == input);

        Console.Write("decimal?: ");

        output = (decimal)Convert.ChangeType(input, typeof(decimal?));

        Console.WriteLine(output == input);

    }

}