using System;
using System.Runtime.InteropServices;

// csc /nologo /out:simple.exe Simple.cs && simple
class Simple
{
	[Serializable]
	[StructLayout(LayoutKind.Sequential)]
	public struct Foo
	{
		public int f1;
		public short f2;
		public double f3;
		
		public Foo(int a1, short a2, double a3)
		{
			f1 = a1;
			f2 = a2;
			f3 = a3;
		}
		public override string ToString()
		{
			return string.Format("Foo{{{0}, {1}, {2}}}", f1, f2, f3);
		}
	}
	
	[DllImport("simple-native", EntryPoint="forward", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
	[return: MarshalAs(UnmanagedType.U1)]
	static extern char do0(int type);
	public static char do0() { return do0(0); }
	
	[DllImport("simple-native", EntryPoint="forward", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
	static extern string do1(int type);
	public static string do1() { return do1(1); }
	
	[DllImport("simple-native", EntryPoint="forward", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
	static extern float do2(int type, float f1, float f2);
	public static float do2(float f1, float f2) { return do2(2, f1, f2); }
	
	[DllImport("simple-native", EntryPoint="forward", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
	static extern double do3(int type, double d1, double d2);
	public static double do3(double d1, double d2) { return do3(3, d1, d2); }
	
	[DllImport("simple-native", EntryPoint="forward", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
	static extern double do4(int type, Foo foo);
	public static double do4(Foo foo) { return do4(4, foo); }
	
	[DllImport("simple-native", EntryPoint="forward", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
	static extern Foo do5(int type, Foo foo1, Foo foo2);
	public static Foo do5(Foo foo1, Foo foo2) { return do5(5, foo1, foo2); }
	
	[DllImport("simple-native", EntryPoint="forward", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
	static extern string do6(int type, Foo foo1);
	public static string do6(Foo foo1) { return do6(6, foo1); }
	
	
	public static void Main()
	{
		Console.WriteLine(do0());
		Console.WriteLine(do1());
		Console.WriteLine(do6(new Foo(10, 11, 12)));
		Console.WriteLine(do2(1,2));
		Console.WriteLine(do3(3,4));
		Console.WriteLine(do4(new Foo(1,2,3)));
		Console.WriteLine(do5(new Foo(1,2,3), new Foo(4,5,6)));
	}
}