using System;

public class Program

{

    private static Array CreateSized<T>(Array sourceArray)

    {

        int[] shape = new int[sourceArray.Rank];

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

            shape[i] = sourceArray.GetLength(i);

        return Array.CreateInstance(typeof(T), shape);

    }

    private static void OutputArrayInfo(string name, Array sourceArray)

    {

        Console.Write($"{name} Rank: {sourceArray.Rank}, Type:{ sourceArray.GetType()}, Size: ");

        for (int i = 0; i < sourceArray.Rank; i++)

            Console.Write($"{i}/{sourceArray.GetLength(i)}, ");

        Console.WriteLine();

    }

    public static void Main()

    {

        int [] a =  { 1, 2, 4, 8 };

        int [,] b = { { 10, 20, 40, 80 }, {100, 200, 400, 800 } };

        var fa = (float[]) CreateSized<float>(a);

        OutputArrayInfo(nameof(a), a);

        OutputArrayInfo(nameof(fa), fa);

​

        var fb = (decimal[,])CreateSized<decimal>(b);

        OutputArrayInfo(nameof(b), b);

        OutputArrayInfo(nameof(fb), fb);

        fb[0,2] = b[0, 2] * 3.14m;

        fb.SetValue((decimal)b[0, 3] * 3.14m, 0, 3);

​

        Console.WriteLine($"b[0,2]: {b[0,2]} / {b.GetValue(0, 2)}; b[0,3]: {b[0,3]} / {b.GetValue(0, 3)}");

        Console.WriteLine($"fb[0,2]: {fb[0,2]} / {fb.GetValue(0, 2)}; fb[0,3]: {fb[0,3]} / {fb.GetValue(0, 3)}");

​

        dynamic fc = CreateSized<double>(b);

        fc[0, 2] = b[0, 2] * 3.141592;

        Console.WriteLine($"fc[0, 2]: {fc[0, 2]}");

        Console.WriteLine(fc[0, 2]);

    }

}