using System;

using System.Collections.Generic;

//

//Borrow from https://www.dotnetperls.com/yield

//

public class Program

{

    public static IEnumerable<int> ComputePower(int number, int exponent)

    {

        //

        //Return the result with yield out of a loop. Func/Method does not stop on 'return'. Yield return, returns control to continue below.

        //

        yield return 0; 

        int exponentNum = 0;

        int numberResult = 1;

        //

        // Continue loop until the exponent count is reached.

        //

        while (exponentNum < exponent)

        {

            //

            // Multiply the result.

            //

            numberResult *= number;

            exponentNum++;

            //

            // Return the result with yield.

            //

            yield return numberResult;

        }

    }

    public static void Main()

    {

        //

        // Compute powers of two

        //

        int exponent = 0; //no access to interator

        foreach (int value in ComputePower(2, 17))

        {

            Console.WriteLine("2^" + (exponent++).ToString() +"="+ value);          

        }

        Console.WriteLine();

    }

}