using System;

using System.Collections.Generic;

​

// Implement the Exponentiation function. This function should take two integers, let’s say n and p

// as parameters and return n raised to the p-th power.

​

// The function should return the appropriate result after the power operation is done,

// or throw the appropriate exception as detailed below:

//   A) If either n or p is negative, then the method must throw an exception which says:

//      "n or p should not be negative."

//   B) If both n and p are zero, then the method must throw an exception which says

//      "n and p should not be zero."

​

// Expected output

//   9

//   64

//   n or p should not be negative.

//   n and p should not be zero.

public class Program

{

    private static readonly List<Tuple<int, int>> list = new List<Tuple<int, int>>()

    {

        Tuple.Create( 3, 2),

        Tuple.Create( 4, 3),

        Tuple.Create( 2,-4),

        Tuple.Create( 0, 0),

    };

    private static int Exponentiation( int n, int p )

    {

        if (n > 0 && p > 0)

        {

            p--;

            int e = n;

            while (p > 0)

            {

                e *= n;

                p--;

            }

            return e;

        }

        else if (n == 0 && p == 0)

        {

            throw new Exception("n and p should not be zero.");

        }

        else

        {

            throw new Exception("n or p should not be negative.");

        }

    }

    public static void Main()

    {

        foreach(Tuple<int, int> pair in list)

        {

            try

            {

                Console.Out.WriteLine(Program.Exponentiation(pair.Item1, pair.Item2));

            }

            catch(Exception e)

            {

                Console.Out.WriteLine(e.Message);

            }

        }

    }

}