QuadraticEquationSecondVersion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace QuadraticEquation
{
    class QuadraticEquation
    {
        static void Main(string[] args)
        {
            try
            {
                Console.Write("Enter the equation this way - ax^2+bx+c=0: ");
                string equation = Console.ReadLine();
                int a = int.Parse(equation.Substring(0, 1));
                int b = int.Parse(equation.Substring(4, 2));
                int c = int.Parse(equation.Substring(7, 2));
                if (a != 0)
                {
                    double discriminant = (b * b) - (4 * a * c);
                    if (discriminant > 0)
                    {
                        double firstRoot = (-b + Math.Sqrt(discriminant)) / 2 * a;
                        double secondRoot = (-b - Math.Sqrt(discriminant)) / 2 * a;
                        Console.WriteLine("The roots of the equation are: {0} and {1}", Math.Round(firstRoot), Math.Round(secondRoot));
                    }
                    else if (discriminant == 0)
                    {
                        double root = -b / 2 * a;
                        Console.WriteLine("The only root of the equation is {0}.", root);
                    }
                    else
                    {
                        Console.WriteLine("The equation has no real roots.");
                    }
                }
                else
                {
                    double singleRoot = -c / b;
                    Console.WriteLine("The equation has a single root - {0}.", Math.Round(singleRoot, 2));
                }
            }
            catch (FormatException)
            {
                Console.WriteLine("You have entered some invalid data. Please try again.");
            }

        }
    }
}