//AGOSTO, JOAN CHRISTINE

//CCP 1103 - ITBC

//FIBONACCI FREEZE

using System;

​

public class Program

{

    public static void Main(string[] args)

    {

        string input;

        double firstNumber = 0;

        double secondNumber = 1;

        double sequence = 0;

        double number;

        Console.WriteLine("Fibonacci Freeze");

        Console.Write("Enter a number: ");

        input = Console.ReadLine();

        if (Double.TryParse(input, out number) == true)

        {

            if (number <= 0)

            {

                Console.WriteLine("Zero or negative numbers are not allowed.");

            }

            else if (number > 51)

            {

                Console.WriteLine("Inputs above 50 are not allowed.");

            }

            else

            {

                int counter = 1;

                while (counter <= number)

                {

                    sequence = firstNumber;

                    firstNumber = secondNumber;

                    secondNumber = sequence + firstNumber;

                    counter += 1;

                }

​

                Console.WriteLine("The fibonacci freeze for {0} is {1:#,0}.", number, firstNumber);

            }

        }

        else

        {

            Console.WriteLine("Please enter a numeric value.");

        }

    }

}