Console Input/Output - Problem 6.

using System;

    class QuadraticEquation
    {
        static void Main()
        {
            Console.Write("Enter a: ");
            int a = int.Parse(Console.ReadLine());
            Console.Write("Enter b: ");
            int b = int.Parse(Console.ReadLine());
            Console.Write("Enter c: ");
            int c = int.Parse(Console.ReadLine());
            double d = (b * b) - (4 * a * c);

            if (d >= 0)
            {
                if (d == 0)
                {
                    Console.WriteLine("The quadratic equation with coefficients a={0}, b={1} and c={2} has one root:", a, b, c);
                    Console.WriteLine("x= {0}", (-b/(2*a)));
                }
                else
                {
                    Console.WriteLine("The quadratic equation with coefficients a={0}, b={1} and c={2} has the following roots:", a, b, c);
                    Console.WriteLine("x1= {0}", ((-b+(Math.Sqrt(d)))/(2*a)));
                    Console.WriteLine("x2= {0}", ((-b-(Math.Sqrt(d)))/(2*a)));
                }
            }
            else
            {
                Console.WriteLine("The quadratic equation with coefficients a={0}, b={1} and c={2} has NO roots:", a, b, c);
            }
        }
    }