// PANGILINAN, ANTHONET S.

//FIBONACCI FREEZE

//CCP1103- ITCC

​

using System;

​

namespace FibonacciFreeze

{

    public class Program

    {

        public static void Main(string[] args)

        {

            String input;

            int frozenNumber;

            int fibNum = 0;

            int prevNum = 1;

​

            Console.WriteLine("Fibonacci Freeze \n");

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

            input = Console.ReadLine();

​

            if (Int32.TryParse(input, out frozenNumber) == true)

            {

                if (frozenNumber > 0)

                {

                    if (frozenNumber <= 50)

                    {

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

                        {

                            int temp = fibNum;

                            fibNum = prevNum;

                            prevNum = temp + prevNum;

                        }

                        Console.WriteLine("The fibonacci number for " + frozenNumber + " is {0}.", fibNum);

                    }

                    else

                    {

                        Console.WriteLine("Invalid input. Enter values 1 to 50 only.");

                    }

                }

                else

                {

                    Console.WriteLine("Zero or negative input is not allowed.");

                }

            }

            else

            {

                Console.WriteLine("Invalid input. Enter numeric values only.");

            }

        }

    }

}

​