using System;

public class Program

{

    public static void Main()

    {

        Random randy = new Random();

        Console.WriteLine("All about arrays!");

        Console.WriteLine("An array is a collection of related items");

        const int aSize = 5;

        int [] numbers  = new int [aSize]; // declared or instanciate

        for (int i = 0; i < aSize; i++)

        {

            numbers[i] = randy.Next(100, 1000);

            Console.WriteLine(numbers[i]);

        }

        Console.WriteLine("And now, to search an array...");

        aSize = 10;

        int [] searchArray = new int[aSize];

        for(int i = 0; i < aSize; i++)

        {

            searchArray[i] = randy.Next(1,20);  

            Console.Write(searchArray[i] + ", ");

        }

        // ask the user for a number to search

        // stomp through searchArray, and compare each position

        // to see if it contains the user's request

        // report if it is found or not.

        int searchNum;

        Console.Write("Enter a number from 1 to 20 inclusive: ");

        String temp = Console.ReadLine();

        searchNum = Int16.Parse(temp);

        Console.WriteLine("You entered: " + searchNum);

        bool isFound = false;

        int count = 0;

        for(int i = 0; i < aSize && !isFound; i++)

        {

        count++;

        if(searchNum == (searchArray[i]))

           {

               isFound = true;

                //break;

           }

    }

        if (isFound)

        {

            Console.WriteLine("Found");

        }

        else

        {

            Console.WriteLine(" Not Found");

        }

        Console.WriteLine("This loop ran " + count + " times");

        isFound = !isFound;

        Console.WriteLine("Print the numbers in reverse");

        for(int pos = aSize - 1; pos >= 0; pos--)

        {

            Console.Write(searchArray[pos] + " ");  

        }

        Console.WriteLine();

        Console.WriteLine("Populating an array with random numbers");

        int [] searchArray2 = new int [10];

        for(int i = 2; i < searchArray2.Length; i++)

        {

            searchArray[i] = randy.Next(1,31);

            Console.WriteLine(searchArray2[i] + ", ");

        }

        Console.WriteLine();

        int searchNum2;

        Console.Write("Enter a nuber to search: ");

        searchNum2 = Int16.Parse(Console.ReadLine());

        for(int j = 0; j < searchArray2.Length; j++)

        {

            if(searchNum2 == searchArray2[j])

            {

                Console.WriteLine("Found It");

            }

        }

        Console.WriteLine("Swapping two varibles");

        int a = 17;

        int b = 83;

        int tempNum;

        tempNum = a;

        a = b;

        b = tempNum;

        Console.WriteLine("a = " + a);

        Console.WriteLine("b = " + b);

    }

}