02.03.06.FindFirstBiggerNeighbor

using System;
using BiggerNeighbor;

class FindFirstBiggerNeighbor
{
    public static int sign = 0;

    public static int ValidPosition(int[] elements, int position)
    {
        if (position + 1 < elements.Length && position - 1 >= 0)
        {
            return 1;
        }
        else if (position + 1 == elements.Length)
        {
            return 2;
        }
        else
        {
            return 3;
        }
    }

    public static bool BiggerCheck(int[] elements, int position)
    {
        sign = ValidPosition(elements, position);
        if (sign == 1 && elements[position] > elements[position - 1] && elements[position] > elements[position + 1])
        {
            return true;
        }
        else if (sign == 2 && elements[position] > elements[position - 1])
        {
            return true;
        }
        else if (sign == 3 && elements[position] > elements[position + 1])
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    static void Main()
    {
        int[] array = { 10, 2, 3, 4, 5, 6, 7, 8, 6 };

        for (int i = 0; i < array.Length; i++)
        {
            int index = i;

            bool checkBool = BiggerCheck(array, index);
            if (sign == 1 && checkBool == true)
            {
                Console.WriteLine("{0} is bigger than {1} and {2}", array[index], array[index - 1], array[index + 1]);
                Environment.Exit(0);
            }
            else if (sign == 2 && checkBool == true)
            {
                Console.WriteLine("{0} is bigger than {1} and (empty)", array[index], array[index - 1]);
                Environment.Exit(0);
            }
            else if (sign == 3 && checkBool == true)
            {
                Console.WriteLine("{0} is bigger than (empty) and {1}", array[index], array[index + 1]);
                Environment.Exit(0);
            }
        }
        Console.WriteLine("-1, no such element");
    }
}