IConvertible, interface

using System;

namespace ConsoleApplication2
{

	/// Class that implements IConvertible
	class Complex : IConvertible
	{
		double	x;
		double	y;

		public Complex(double x, double y)
		{
			this.x = x;
			this.y = y;
		}

		public TypeCode GetTypeCode()
		{
			return TypeCode.Object;
		}

		bool IConvertible.ToBoolean(IFormatProvider provider)
		{
			if(	(x != 0.0) || (y != 0.0) )
				return true;
			else
				return false;
		}

		double GetDoubleValue()
		{
			return Math.Sqrt(x*x + y*y);
		}

		byte IConvertible.ToByte(IFormatProvider provider)
		{
			return Convert.ToByte(GetDoubleValue());
		}

		char IConvertible.ToChar(IFormatProvider provider)
		{
			return Convert.ToChar(GetDoubleValue());
		}

		DateTime IConvertible.ToDateTime(IFormatProvider provider)
		{
			return Convert.ToDateTime(GetDoubleValue());
		}

		decimal IConvertible.ToDecimal(IFormatProvider provider)
		{
			return Convert.ToDecimal(GetDoubleValue());
		}

		double IConvertible.ToDouble(IFormatProvider provider)
		{
			return GetDoubleValue();
		}

		short IConvertible.ToInt16(IFormatProvider provider)
		{
			return Convert.ToInt16(GetDoubleValue());
		}

		int IConvertible.ToInt32(IFormatProvider provider)
		{
			return Convert.ToInt32(GetDoubleValue());
		}

		long IConvertible.ToInt64(IFormatProvider provider)
		{
			return Convert.ToInt64(GetDoubleValue());
		}

		sbyte IConvertible.ToSByte(IFormatProvider provider)
		{
			return Convert.ToSByte(GetDoubleValue());
		}

		float IConvertible.ToSingle(IFormatProvider provider)
		{
			return Convert.ToSingle(GetDoubleValue());
		}

		string IConvertible.ToString(IFormatProvider provider)
		{
			return String.Format("({0}, {1})", x, y);
		}

		object IConvertible.ToType(Type conversionType, IFormatProvider provider)
		{
			return Convert.ChangeType(GetDoubleValue(),conversionType);
		}

		ushort IConvertible.ToUInt16(IFormatProvider provider)
		{
			return Convert.ToUInt16(GetDoubleValue());
		}

		uint IConvertible.ToUInt32(IFormatProvider provider)
		{
			return Convert.ToUInt32(GetDoubleValue());
		}

		ulong IConvertible.ToUInt64(IFormatProvider provider)
		{
			return Convert.ToUInt64(GetDoubleValue());
		}

	}

	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	class Class1
	{
		static void Main(string[] args)
		{

			Complex		testComplex = new Complex(4,7);

			WriteObjectInfo(testComplex);
			WriteObjectInfo(Convert.ToBoolean(testComplex));
			WriteObjectInfo(Convert.ToDecimal(testComplex));
			WriteObjectInfo(Convert.ToString(testComplex));

		}

		static void WriteObjectInfo(object testObject)
		{
			TypeCode	typeCode = Type.GetTypeCode( testObject.GetType() );

			switch( typeCode )
			{
				case TypeCode.Boolean:
					Console.WriteLine("Boolean: {0}", testObject);
					break;

				case TypeCode.Double:
					Console.WriteLine("Double: {0}", testObject);
					break;
								
				default:
					Console.WriteLine("{0}: {1}", typeCode.ToString(), testObject);
					break;
			}
		}
	}
}