QuadraticEquation

using System;

//Write a program that reads the coefficients a, b and c of a quadratic equation ax2 + bx + c = 0 and solves it (prdoubles its real roots).

class QuadraticEquation
{
    static void Main()
    {
        Console.Write("Enter value for 'a': ");
        double a = double.Parse(Console.ReadLine());
        Console.Write("Enter value for 'b': ");
        double b = double.Parse(Console.ReadLine());
        Console.Write("Enter value for 'c': ");
        double c = double.Parse(Console.ReadLine());
        double D = (b * b) - (4 * a * c);
        if (D < 0)
        {
            Console.WriteLine("no real roots");
        }
        else
        {
            if (D == 0)
            {
                double x = -b /( 2 * a);
                Console.WriteLine("x1=x2= {0}", x);
            }
            else
            {
                double x1 = ((-b) + Math.Sqrt(D)) / (2 * a);
                double x2 = ((-b) - Math.Sqrt(D)) / (2 * a);
                Console.WriteLine(" x1={0}; x2={1}", x1, x2);
            }
        }
    }

}