using System;

​

public class Program

{

    static int numNumbers;

    static ushort[] numbersUshort = {1, 2, 3, 4};

    static uint[] numbersUint;

    public static void Main() {

        numNumbers = numbersUshort.Length;

        PackInto(numbersUshort, out numbersUint);

        for(int i = 0; i < numbersUint.Length; i++) {

            Console.WriteLine("Packed number#" + i + ": " + Convert.ToString(numbersUint[i], 2).PadLeft(32,'0'));

        }

        ushort[] unpacked;

        UnpackInto(numbersUint, out unpacked, numNumbers);

        for(int i = 0; i < unpacked.Length; i++) {

            Console.WriteLine("Unpacked number#" + i + ": " + unpacked[i]);

        }

    }

    static uint[] halves = {

        0xFFFF0000,

        0x0000FFFF

    };

    public static void PackInto(ushort[] source, out uint[] destination) {

        destination = new uint[(int) Math.Ceiling(source.Length / 2f)];

        for(int i = 0; i < destination.Length; i++) {

            uint a = (uint) source[2*i];

            uint b = (uint) source[2*i + 1];

            // a is little end, b goes to big end

            b <<= 16;

            destination[i] = a + b;

        }

    }

    public static void UnpackInto(uint[] source, out ushort[] destination, int count) {

        destination = new ushort[count];

        int major, minor;

        for(int i = 0; i < count; i++) {

            major = i / 2;

            minor = i % 2;

            destination[i] = (ushort) (source[major] >> (16*(minor)));

        }

    }

}