using System;

public class Program

{

     public static int a = 0,b = 0;

        public static double x;

        static void Main(string[] args)

        {

            try

            {

                Console.WriteLine("Enter a:");

                a = int.Parse(Console.ReadLine());

                Console.WriteLine("Enter b:");

                b = int.Parse(Console.ReadLine());

​

                if (a > 0)

                {

                    if (b > 0) Console.WriteLine("x is betwean(" + String.Format("{0:0.00}", -1 * Math.Sqrt((double)b / (double)a)) + ";" + String.Format("{0:0.00}",Math.Sqrt((double)b / (double)a)) + ")");

                    else if (b <= 0) Console.WriteLine("No real root");

                }

                else if (a < 0)

                {

                    if (b <= 0) Console.WriteLine("x is betwean(-inf;{0}) + ({1}; + inf)", String.Format("{0:0.00}", -1 * Math.Sqrt((double)b / (double)a)), String.Format("{0:0.00}", Math.Sqrt((double)b / (double)a)));

                    else if (b > 0) Console.WriteLine("every root is an answer");

                }

                else if (a == 0)

                {

                    if (b > 0) Console.WriteLine("every root is an answer");

                    else if (b <= 0) Console.WriteLine("No real root");

                }

                Console.ReadLine();

            }

            catch (Exception)

            {

                Console.WriteLine("!!Please enter only ints!!");

                Console.ReadLine();

​

            }

        }

}