nastya

using System;

namespace main {
    class Program {
        public static void Main(string [] args) {
            Console.Write("Значение a=");
            double a = double.Parse(Console.ReadLine());
            Console.Write("Значение b=");
            double b = double.Parse(Console.ReadLine());
            Console.Write("Значение c=");
            double c = double.Parse(Console.ReadLine());
            double x1, x2;
            if (answ(a, b, c, out x1, out x2)) {
                if (x1 == x2)
                    Console.WriteLine("1 корень:\nx1 = {0}", x1);
                else
                    Console.WriteLine("2 корня:\nx1 = {0}\nx2 = {1}", x1, x2);

            }
            else
                Console.WriteLine("Коней нет");
        }

        static bool answ(double a, double b, double c, out double x1, out double x2) {
            double d = b * b - 4 * a * c;
            if (d < 0 || a == 0) {
                x1 = 0;
                x2 = 0;
                return false;
            }
            x1 = (-b + Math.Sqrt(d)) / (2 * a);
            x2 = (-b - Math.Sqrt(d)) / (2 * a);
            return true;
        }
    }
}