using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

​

namespace TD1

{

    public class Program

    {

        public static void Main(string[] arg)

        {

            Console.WriteLine("Soit ax^2+bx+c");

            Console.WriteLine("a ?");

            double a=Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("b ?");

            double b=Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("c ?");

            double c=Convert.ToDouble(Console.ReadLine());

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

            if (discriminant>0)

            {

                double x1=(-b-Math.Sqrt(discriminant))/(2*a);

                double x2=(-b+Math.Sqrt(discriminant))/(2*a);

                Console.WriteLine("Les racines sont:");

                Console.WriteLine("x1="+x1);

                Console.WriteLine("x2="+x2);

            }

            if (discriminant==0)

            { 

                double x0=(-b)/(2*a);

                Console.WriteLine("La racine est:");

                Console.WriteLine("x="+x0);

            }

            if (discriminant<0)

            {

                Console.WriteLine("Pas de racine réelle");

            }   

        }

    }

}