using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace BasicIfPractice

{

    internal class Program

    {

        static void Main(string[] args)

        {

            int number;

​

            while(true)

            {

                Console.Write("Input Integer: ");

                if (int.TryParse(Console.ReadLine(), out number))

                {

                    break;

                }

                Console.WriteLine("Invalid Input!");

            }

​

            Console.WriteLine(positiveNegative(number));

        }

​

        static String positiveNegative(int number)

        {

            if(number > 0)

            {

                return "Positive";

            }

​

            if(number < 0)

            {

                return "Negative";

            }

​

            return "Zero";

        }

​

    }

}

​