using System;

using System.Collections.Generic;       

​

public class QuadraticEq

    {

    int a=0,b=0,c=0;

    public QuadraticEq(int ca, int cb, int cc)

    {

        this.a=ca;

        this.b=cb;

        this.c=cc;

    }

    public double d()

{

            double dis=b*b-4*a*c;

        return dis;

}

    private double discriminant;

    public double Discriminant

{

    get{ discriminant=d();

        return discriminant; }

}

public  double[] GetRealRoots()  {

    double[]array;

    if (d()>0)

    {array=new double[2];

        double s=Math.Sqrt(d());

    double root1=(-b+s)/2/a;

    double root2=(-b-s)/2/a;

    array[0]=root1;

     array[1]=root2;

    }

    else if(d()==0)

    {

        array=new double[1];

        double root=-b/2/a;

        array[0]=root;

    }

    else

    {

        Console.WriteLine("Not real");

        array=new double[0];

    }

​

    return array;

}

}

public class Program

{

    public static void Main()

    {

        QuadraticEq q = new QuadraticEq(1,5,3);

Console.WriteLine("d = {0}", q.Discriminant);

        double[] results = q.GetRealRoots();

foreach (double x in results)

Console.WriteLine(x);

    }

}