namespace Gcd
{
	/// <summary>
	/// Command-line calculator for greatest common divisor of two integers.
	/// </summary>

	public class GcdClient 
	{
		protected static PairWithGcdR pairRR = new PairWithGcdRR(0, 0);
		protected static PairWithGcdR pairRI = new PairWithGcdRI(0, 0);
		protected static PairWithGcdV pairVR = new PairWithGcdVR();
		protected static PairWithGcdV pairVI = new PairWithGcdVI();

		protected const string Hint =
			"Please call the gcd client with two integer arguments! ";

		public static void Write (string name, int p, int q, int gcd)
		{
			System.Console.WriteLine("Gcd" + name + " (" + p + ", " + q + ") = " + gcd);	
		}
					   
		public static void Main (string[] args) 
		{
			if (args.Length < 2) 
			{
				System.Console.WriteLine("Missing Argument. " + Hint);
			} 
			else 
			{
				try
				{
					int p = System.Convert.ToInt32(args[0]);
					int q = System.Convert.ToInt32(args[1]);
					pairRR.Set(p, q);
					pairRI.Set(p, q);
					pairVR.Set(p, q);
					pairVI.Set(p, q);
					Write("RR", p, q, pairRR.Gcd());
					Write("RI", p, q, pairRI.Gcd());
					Write("VR", p, q, pairVR.Gcd());
					Write("VI", p, q, pairVI.Gcd());
				} 
				catch (System.Exception e) 
				{
					System.Console.WriteLine("Wrong Argument. " + Hint + e.Message);
				}
			}
		}
	}
}