using System;

public class Program

{

    public static void Main()

    {

        string restart = " This coul be anything" ; 

        while ( restart!= "q") 

        { 

    Console.WriteLine(" pLease enter a number. " ); 

             String number = Console.ReadLine(); 

            double answer ; 

            if ( double.TryParse( number, out answer ))

                { 

                    Console.WriteLine("Good Job!" ); 

                        double square = answer * answer;

                        Console.WriteLine(" The square  of that number is  " + square ); 

            } 

        else 

            Console.Clear(); 

            Console.WriteLine(" Please enter a number"); 

        } 

    } 

}