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public class Functions
{
    public static long Factorial(int n)
    {
        if (n < 0) { return -1; }    //error result - undefined
        if (n > 256) { return -2; }  //error result - input is too big

        if (n == 0) { return 1; }

        // Calculate the factorial iteratively rather than recursively:

        long tempResult = 1;
        for (int i = 1; i <= n; i++)
        {
            tempResult *= i;
        }
        return tempResult;
    }
}
class MainClass
{
    static int Main(string[] args)
    {
        // Test if input arguments were supplied:
        if (args.Length == 0)
        {
            System.Console.WriteLine("Please enter a numeric argument.");
            System.Console.WriteLine("Usage: Factorial <num>");
            return 1;
        }

    &


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