QuadraticEquation

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;



    class QuadraticEquation
    {
        static void Main(string[] args)
        {
            double a, b, c, d, x, x1, x2;
            Console.Write("a= ");
            a = double.Parse(Console.ReadLine());
            Console.Write("b= ");
            b = double.Parse(Console.ReadLine());
            Console.Write("c= ");
            c = double.Parse(Console.ReadLine());
            d = b * b - (4 * a * c);
            x = -b / (2 * a);
            x1 = (-b - Math.Sqrt(d)) / (2 * a);
            x2 = (-b + Math.Sqrt(d)) / (2 * a);
         if (a == 0)
         {
             Console.WriteLine("The equation is not square!");
         }
         else if (d < 0)
         {
             Console.WriteLine("Тhe equation has no real roots! D = " + d);
         }
         else if (d == 0)
         {

             Console.WriteLine("D = 0, x = " + x);
         }


         else if (d > 0)
                {

                    Console.WriteLine("D = " + d + " " + "x1 = " + x1 + " " + "x2 = " + x2);
                }
          }
      }