using System;

public class Program

{

    public static double getDoubleNum(){

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

        double n;

        while (!Double.TryParse(Console.ReadLine(), out n)){

            Console.WriteLine("Number is invalid!");

        }

        return n;

    }

    public static char getOperator(){

        char c;

        Console.WriteLine("Enter in an operator (+,-,/,*)");

        while (!Char.TryParse(Console.ReadLine(), out c)){

            Console.WriteLine("Please enter in a valid charcter!");

        }

        return c;       

    }

    public static void Main()

    {

        Console.WriteLine("MATH APP");

        double h;

        h = getDoubleNum();

        char op;

        op = getOperator();

    }

}