C#Basics HW4 Problem6

using System;
class QuadraticEquation
{
    static void Main()
        {
            Console.WriteLine("This program solves quadratic equations of the form ax^2 + bx + c = 0");
            Console.Write("Please enter coefficient a: ");
            double a = double.Parse(Console.ReadLine());
            Console.Write("Please enter coefficient b: ");
            double b = double.Parse(Console.ReadLine());
            Console.Write("Please enter coefficient c: ");
            double c = double.Parse(Console.ReadLine());
            double discriminant = b * b - 4 * a * c;     //calculations start here
            if (discriminant < 0)
            {
        Console.WriteLine("No real roots");
                return;                                 //Optional
            }
            else if (discriminant == 0)
            {
                double x = - b / 2 / a;
                Console.WriteLine("Double root x1 = x2 = {0}",x);
            }
            else
            {
                double x1 = ( - b - Math.Sqrt(discriminant)) / 2 / a; // Weird, usually the first root is with + in the formula
                double x2 = ( - b + Math.Sqrt(discriminant)) / 2 / a; // I guess they want to test our attentiveness :)
                Console.WriteLine("The solution of the equation is : x1 = {0}, x2 = {1}", x1, x2);
            }
        }
}