Ex, Mo3adala Tarbe3ia

using System;

namespace Mo3adalaTarbe3ia
{
    class Program
    {
        static void Main(string[] args)
        {
            double a;
            double b;
            double c;
            Console.WriteLine("enter a,b,c");
            a = double.Parse(Console.ReadLine());
            b = double.Parse(Console.ReadLine());
            c = double.Parse(Console.ReadLine());

            if (a == 0)
            {
                Console.WriteLine("Error, 'A' should not be zero");
            }
            else
            {
                double delta = b * b - 4 * a * c;
                if (delta == 0)
                {
                    // one solution
                    Console.WriteLine("Your numbers have 1 Solution ");
                    //double sol = -b / 2 * a;
                    Console.WriteLine("x1 = {0}", -b / 2 * a);
                }
                else
                {
                    if (delta > 0)
                    {
                        // two solutions
                        Console.WriteLine("Your numbers have 2 Solutions ");

                        double deltasqrt = Math.Sqrt(delta);
                        double x1 = (-b + deltasqrt) / (2 * a);
                        double x2 = (-b - deltasqrt) / (2 * a);

                        Console.WriteLine("x1 = {0:f2}", x1);
                        Console.WriteLine("x2 = {0:f2}", x2);
                    }
                    else
                    {
                        if (delta < 0)
                        {
                            Console.WriteLine("Your numbers have no Solutions ");
                        }

                    }
                }

                // min or max point
                double x = -b / (2 * a);
                double y = a * x * x + b * x + c;
                String st;
                if (a > 0)
                {
                    st = "min";
                }
                else
                {
                    st = "max";
                }
                Console.WriteLine("{0} = ({1}, {2})", st, x, y);
                //Console.WriteLine("{0} = ({1}, {2})", a > 0 ? "min" : "max", x, y);
            }
        }
    }
}