internal class Program
{


    //Program to show how variables can store different data types

    public static int ValidationNumber() // Method for validating a number and ensuring data has been entered
    {
        int UserInput; // defines the UserInput integer
        do // defines the start of the do while loop
        {
            try // tries the code and let's it run
            {
                UserInput = Int16.Parse(Console.ReadLine()); // takes the users input and converts it into an integer using parse
                if (UserInput <= 0 || UserInput > 130) // checks if the users age is equal to or below 0 or greater than 130
                {
                    Console.WriteLine("Please enter valid data"); // asks the user to enter valid data
                }
                else // performs this code if the data entered is valid
                {
                    break; // breaks out of the do while loop
                }
            }
            catch (FormatException) // performs the code in the event that a format exception has occurred, aka data that shouldn't be entered
            {
                Console.WriteLine("Error, unsuitable data entered. Please enter valid data"); // informs the user they have entered unsuitable data
            }

        } while (true); // will continuously perform the do while loop until a break has been reached

        return UserInput;
    }

    public static float ValidationFloat() // Method for validating a whole number or a float and ensuring data has been entered
    {
        float UserInput; // defines the UserInput float
        do // defines the start of the do while loop
        {
            try // tries the code and let's it run
            {
                UserInput = float.Parse(Console.ReadLine()); // takes the users input and converts it into a float using parse
                if (UserInput <= 0 || UserInput > 20) // checks if the users number is less than or equal to 0 or greater than 20
                {
                    Console.WriteLine("Please enter valid data"); // asks the user to enter valid data
                }
                else // performs this code if the data entered is valid
                {
                    break; // breaks out of the do while loop
                }
            }
            catch (FormatException) // performs the code in the event that a format exception has occurred, aka data that shouldn't be entered
            {
                Console.WriteLine("Error, unsuitable data entered. Please enter valid data"); // informs the user they have entered unsuitable data
            }

        } while (true); // will continuously perform the do while loop until a break has been reached

        return (float)UserInput;
    }




    public static string ValidationString() // declares a method named ValidationString, used for validating any data and ensuring data has been entered
    {
        string Data; // defines the string Data
        do // beginning of the do while loop
        {
            try // performs the code and leads to "catch" if a format exception is given
            {
                Data = Console.ReadLine(); // sets the string "Data" to the users input
                if (Data == "") // checks if the user has entered data for the "Data" string
                {
                    Console.WriteLine("Please enter data"); // tells the user they need to enter data
                }
                else // performed if the user did enter data
                {
                    break; // breaks out of the do while loop
                }

            }
            catch (FormatException) // performs the code in the event that a format exception has occurred, aka data that shouldn't be entered
            {
                Console.WriteLine("Error, unsuitable data entered. Please enter valid data"); // informs the user they have entered unsuitable data
            }

        } while (true); // will continuously perform the do while loop until a break has been reached

        return Data;
    }


    private static void Main(string[] args) // The start of the main program
    {

        Console.WriteLine("Please enter your surname"); // Asks the user for their surname
        string UserSurname = ValidationString(); // Sets the string UserSurname to whatever the ValidationString method results in
        Console.WriteLine("Your surname is " + UserSurname + " !"); // outputs the users surname back to them

        Console.WriteLine("Please enter your national insurance number"); // Asks the user for their national insurance number
        string UserNationalInsuranceNumber = ValidationString(); // Sets the string UserNationalInsuranceNumber to whatever the ValidationString method results in
        Console.WriteLine("Your national insurance number is " + UserNationalInsuranceNumber + " !"); // outputs the users national insurance number back to them


        Console.WriteLine("Please enter your age"); // Asks the user for their age
        int UserAge = ValidationNumber(); // Sets the integer UserAge to whatever the ValidationNumber method results in
        Console.WriteLine("You are " + UserAge + " years old!"); // outputs the users age back to them

        Console.WriteLine("Please enter a number between 1 and 20 (Including or not including a decimal number)"); // Asks the user for a whole or decimal number between 1 and 20
        float UserNumber = ValidationFloat(); // Sets the float UserNumber to whatever the ValidationFloat method results in
        Console.WriteLine("Your number is " + UserNumber + " !"); //Outputs the users back to them

        Console.WriteLine("Press enter to exit the program"); // informs the user they must press the enter key to exit the program
        Console.ReadKey(); // reads a key being pressed resulting in the program closing

    }
}