using System;

public class Program

{

    public static void Main()

    {

        Console.Clear();

        for (int externalLoop = 0; externalLoop < 1; externalLoop++)

        {

        Console.WriteLine("Enter a sentence of your choosing");

        string sentence = Console.ReadLine();

        Console.Clear();

        //using \n to create new lines

        //uses string.Format to re-enter the user's input

        //writes out the "" with \

        string options = string.Format("What would you like to happen to \"{0}\"?:\n\n1. Replace all spaces with a character of your choosing\n" +

                          "2. Make your sentence into as a dollar value (only for sentences of only numbers)\n3. Present your sentence as a percentage (only for sentences of only numbers, preferably a decimal value)\n4."

                                       + " Break your sentence up into numerical columns (only for sentences of only numbers)\n5. Make your entire sentence uppercase\n6. Make your entire sentence lowercase\n(Enter 1, 2, 3, 4, 5)", sentence);

        Console.WriteLine(options);

        string response = Console.ReadLine();

        int tester = 0;

        string newSentence = "";

        if (response == "1")

        {

            Console.Write("What character would you like to replace spaces with?: ");

            string character = Console.ReadLine();

            newSentence = sentence.Replace(" ", character); //replaces the spaces with the user's input

        }//end of one 

        else if (response == "2")

        {

            for (int firstLoop = 0; firstLoop < 1; firstLoop++)

            {

                int sentenceNumber;

                bool sentenceTesting = int.TryParse(sentence, out sentenceNumber);

                if (sentenceTesting == true)

                {

                    newSentence = string.Format("{0:P}", sentenceNumber);

                }

                else if (sentenceTesting == false)

                {

                    Console.WriteLine("Oops sorry, this function is only avalible for sentences consisting of only numbers\nWould you like to re-enter your sentence?\n(Enter Yes or No)");

                    string response2 =  Console.ReadLine().ToLower(); //lowers the response of the user to prevent need for capitalization

                    if (response2 == "yes" || response2 == "y")

                    {

                        Console.Clear();

                        Console.Write("Please re-enter your sentence as a number: ");

                        sentence = Console.ReadLine();

                        firstLoop -= 1;

                    }

                    else if (response2 == "no" || response2 == "n")

                    {

                        Console.Clear();

                        Console.WriteLine("ok");

                        Console.ReadLine();

                    }

                }

            }

        }//end of two

        else if (response == "3")

        {

            for (int firstLoop = 0; firstLoop < 1; firstLoop++)

            {

                int sentenceNumber;

                bool sentenceTesting = int.TryParse(sentence, out sentenceNumber);

                if (sentenceTesting == true)

                {

                    newSentence = string.Format("{0:P}", sentenceNumber);

                }

                else if (sentenceTesting == false)

                {

                    double sentenceDouble;

                    bool sentenceTestingDouble = double.TryParse(sentence, out sentenceDouble);

                    if (sentenceTestingDouble == true)

                    {

                        newSentence = string.Format("{0:P}", sentenceDouble);

                    }

                    else if (sentenceTestingDouble == false)

                    {

                    Console.WriteLine("Oops sorry, this function is only avalible for sentences consisting of only numbers\nWould you like to re-enter your sentence?\n(Enter Yes or No)");

                    string response2 =  Console.ReadLine().ToLower(); //lowers the response of the user to prevent need for capitalization

                    if (response2 == "yes" || response2 == "y")

                    {

                        Console.Clear();

                        Console.Write("Please re-enter your sentence as a number: ");

                        sentence = Console.ReadLine();

                        firstLoop -= 1;

                    }

                    else if (response2 == "no" || response2 == "n")

                    {

                        Console.Clear();

                        Console.WriteLine("ok");

                        Console.ReadLine();

                    }

                    }

                }

            }   

        } //end of three

        else if (response == "4")

        {

            for (int firstLoop = 0; firstLoop < 1; firstLoop++)

            {

                int sentenceNumber;

                bool sentenceTesting = int.TryParse(sentence, out sentenceNumber);

                if (sentenceTesting == true)

                {

                    newSentence = string.Format("{0:N}", sentenceNumber);

                }

                else if (sentenceTesting == false)

                {

                    Console.WriteLine("Oops sorry, this function is only avalible for sentences consisting of only numbers\nWould you like to re-enter your sentence?\n(Enter Yes or No)");

                    string response2 =  Console.ReadLine().ToLower(); //lowers the response of the user to prevent need for capitalization

                    if (response2 == "yes" || response2 == "y")

                    {

                        Console.Clear();

                        Console.Write("Please re-enter your sentence as a number: ");

                        sentence = Console.ReadLine();

                        firstLoop -= 1;

                    }

                    else if (response2 == "no" || response2 == "n")

                    {

                        Console.Clear();

                        Console.WriteLine("ok");

                        Console.ReadLine();

                    }

                }

            }   

        } //end of 4

        else if (response == "5")

        {

            newSentence = sentence.ToUpper();

        }//end of 5

        else if (response == "6")

        {

            newSentence = sentence.ToLower();

        }//end of 6

        Console.Clear();

        Console.WriteLine("Your new sentence is\n\n {0}", newSentence);

        if (newSentence == "" || sentence == "" || response == "")

            Console.Clear();

        Console.WriteLine("\n\nPress enter to continue");

        Console.ReadLine();

        Console.Clear();

        Console.WriteLine("Would you like to go again? (Enter Yes or No): ");

        string answer = Console.ReadLine().ToLower();

        if (answer == "yes" || answer == "y")

        {

            Console.Clear();

            externalLoop -= 1;

        }

        else if (answer == "no" || answer == "n")

        {

            Console.Clear();

            Console.WriteLine("Fine... I didn't want you to anyway");

            Console.ReadLine();

        }

        }

    }

}