QuadraticEquation

using System;

class QuadraticEquation
{
    static void Main()
    { //ax*x + bx + c = 0
        Console.WriteLine("Enter a, b, c for ax*x + bx + c = 0");
        double a = double.Parse(Console.ReadLine());
        double b = double.Parse(Console.ReadLine());
        double c = double.Parse(Console.ReadLine());
        double x1, x2;
        //d = discriminant
        double d = (b * b) - (4 * a * c);
        if (d == 0)
        {
            x1 = x2 = (-b) / 2 * a;
            Console.WriteLine("x1 = x2 = {0:0.000}", x1);
        }
        else if (d > 0)
        {
            x1 = (-b) + Math.Sqrt(d) / 2 * a;
            x2 = (-b) - Math.Sqrt(d) / 2 * a;
            Console.WriteLine("x1 = {0:0.000}, x2 = {1:0.000}", x1, x2);
        }
        else
        {
            Console.WriteLine("No real roots!");
        }
    }
}