using System;
 
class Program
{
    public static void Main()
    {
        Console.WriteLine("IntPtr.Size: {0}", IntPtr.Size);
        Console.WriteLine();

        // Two rounds, with positive and with negative numbers        
        long test1 = 0x12340000 /* y */ | 0x00005678 /* x */;
        long test2 = 0xDCBA0000 /* y */ | 0x00009876 /* x */;
        
        foreach (long temp in new[] { test1, test2})
        {
            long test = temp;

            if (IntPtr.Size == 8)
            {
                // We "pad" the number so that all the 64 bits are full and a 
                // standard (int)xy conversion will fail.
                test = unchecked((long)((ulong)test | 0xFFFFFFFF00000000ul));
            }
     
            IntPtr xy = (IntPtr)test;
            
            int x = unchecked((short)(long)xy);
            int y = unchecked((short)((long)xy >> 16));
            
            // Other way, more similar to WinAPI
            ushort loword = unchecked((ushort)(ulong)xy);
            ushort hiword = unchecked((ushort)((ulong)xy >> 16));
     
            int x2 = unchecked((int)(short)loword);
            int y2 = unchecked((int)(short)hiword);

            Console.WriteLine("xy: {0:X}", unchecked((ulong)(long)xy));
            Console.WriteLine("x: {0:X}, decimal: {1}, other way: {2:X}, ushort other way: {3:X}", x, x, x2, unchecked((ushort)x2));
            Console.WriteLine("y: {0:X}, decimal: {1}, other way: {2:X}, ushort other way: {3:X}", y, y, y2, unchecked((ushort)y2));
            Console.WriteLine();
        }
    }
}