Conditional Statements - Quadratic Equation

using System;

class QuadraticEquation
{
    static void Main(string[] args)
    {
        double a;
        double b;
        double c;
        double discriminant;
        double x;


        do
        {
            Console.Write("Enter a: ");
            a = double.Parse(Console.ReadLine());
            if (a == 0)
            {
                Console.WriteLine("a should be different from ZERO! ");
            }
        } while (a == 0);


        Console.Write("Enter b: ");
        b = double.Parse(Console.ReadLine());

        Console.Write("Enter c: ");
        c = double.Parse(Console.ReadLine());

        discriminant = (b * b) - (4 * a * c);

        if (discriminant < 0)
        {
            Console.WriteLine("The equation has no solve!");
        }

        else if (discriminant > 0)
        {
            Console.WriteLine("The discriminant is: {0}", discriminant);
            Console.WriteLine("The equation has to solves!");
            x = (-b + Math.Sqrt(discriminant)) / (2 * a);
            Console.WriteLine("The first solve is: {0}", x);
            x = (-b - Math.Sqrt(discriminant)) / (2 * a);
            Console.WriteLine("The second solve is: {0}", x);
        }

        else
        {
            Console.WriteLine("The discriminant is: {0}", discriminant);
            Console.WriteLine("The equation has one solve");
            x = -b / (2 * a);
            Console.WriteLine("The solve is: {0}", x);
        }
    }
}