using System;           

public class Quadtest {

    public static void Main() {

        Console.WriteLine("Enter the values of a, b, c, and d");

        int a, b, c, d;

        // ax^3+bx^2+cx+d = 0 :: (x(x(x(a)+b)+c)+d = 0 using synthetic division

        int dolc, disc, deno;

        double x1, x2, x3;

        // d value over leading coefficient 

        a = Convert.ToInt32(Console.ReadLine());

        b = Convert.ToInt32(Console.ReadLine());

        c = Convert.ToInt32(Console.ReadLine());

        d = Convert.ToInt32(Console.ReadLine());

        if (a > 0) {

            Console.WriteLine("The roots are cubic;");

        } else if (a == 0 && b == 0) { 

            x1 = -d / c;  

            Console.WriteLine("The root is Linear;" + "    " + x1);  

        } else if (a == 0) {

            Console.WriteLine("The roots are quadratic;");

            // the variables shift down, since a = 0 and that's the cubic coefficient;

            // then b is used as a quadratic coefficient and so on

        } if (b > 0) {

            disc = (c * c) - (4 * b * d);

            deno = 2 * b;

             if (disc > 0) {  

                Console.WriteLine("The roots are real and distinct;");  

                x1 = (-c / deno) + (Math.Sqrt(disc) / deno);  

                x2 = (-c / deno) - (Math.Sqrt(disc) / deno);  

                Console.WriteLine("The roots are... " + x1 +  "    " + " AND " +  "    " + x2);  

            } else if (disc == 0) {  

                Console.WriteLine("The roots are a repeated root");  

                x1 = -c / deno;  

                Console.WriteLine("The root is...: " +  "    " + x1);  

            } else {  

                Console.WriteLine("The roots are imaginary roots\n");  

                x1 = -c / deno;  

                x2 = ((Math.Sqrt((4 * b * d) - (c * c))) / deno);  

                Console.WriteLine("Root 1: " +  "    " + x1 + "+i" + x2);  

                Console.WriteLine("Root 2: " +  "    " + x1 + "-i" + x2);

             }

        }

    }

}