/*
 * Aresh Saharkhiz
 * saharkiz@gmail.com
 * Associate Professor / Mapua Institute of Technology / Philippines
 */

using System;

// Introduction to Software Testing
// Authors: Paul Ammann & Jeff Offutt
// Chapter 5, section 5.2, page 191

internal class power_class
{

    public static int power(int left, int right)
    {
        //**************************************
        // Raises Left to the power of Right
        // precondition : Right >= 0
        // postcondition: Returns Left**Right
        //**************************************
        int rslt;
        rslt = left;
        if (right == 0)
        {
            rslt = 1;
        }
        else
        {
            for (int i = 2; i <= right; i++)
            {
                rslt = rslt * left;
            }
        }
        return (rslt);
    }

    public static void Main(string[] argv)
    { // Driver method for power
        // Read two integers from standard input, call power()
        int[] inArr = new int[argv.Length];
        if (argv.Length != 2)
        {
            Console.WriteLine("Usage: java power v1 v2");
            return;
        }

        for (int i = 0; i < argv.Length; i++)
        {
            try
            {
                inArr[i] = Convert.ToInt32(argv[i]);
            }
            catch (FormatException)
            {
                Console.WriteLine("Entry must be a integer, using 1.");
                inArr[i] = 1;
            }
        }
        if (inArr[1] < 0)
        {
            Console.WriteLine("Right must be large or equal to 0, using 1.");
            inArr[1] = 1;
        }

        Console.WriteLine("The result is: " + power(inArr[0], inArr[1]));
    }

}