using System;

​

public class Equation

{

    public int a, b, c;//change to public

    public Equation(int a, int b, int c)

    {

        this.a = a;

        this.b = b;

        this.c = c;

    }

    public Equation(int b, int c)

    {

        this.a = 0;

        this.b = b;

        this.c = c;

    }

    public Equation(int c)

    {

        this.a = 0;

        this.b = 0;

        this.c = c;

    }

    public override string ToString()

    {

        return a + "x^2+" + b + "x+" + c;

    }

}

​

/////////////////////////////////////////////////////////////////////////

​

//subclass=derived class

public class QuadraticEquation : Equation{

    //take home ex.3 q3

    public double x,y,z,discriminant, real, root;

​

    public double QuadraticEquation(double x,double y, double z) : base(x,y,z)

    {//A read-only property double Discriminant that represents discriminant to the equation

        get

        {

            discriminant = (y * y) - (4 * x * z);

​

            if (discriminant > 0)

                return 2;

            else if (discriminant == 0)

                return 1;

            else return -1;

        }

    }

​

    public double[] Solve() {

        real = (-b + Math.Sqrt(QuadraticEquation)) / (2*a);

        root= (-b - Math.Sqrt(QuadraticEquation)) / (2*a);

​

        if (QuadraticEquation > 0) {

            double[] numbers = new double[2];

            numbers[0] = real;

            numbers[1] = root;

            return numbers;

        }

        else if (QuadraticEquation == 0)

        {

            double[] numbers = new double[1];

            numbers[0] = real;

            return numbers;

        }

        else //(discriminant < 0)

        {

            double[] numbers = new double[0];

            return numbers;

        }

    }

}    

​

​

public class Program

{

    public static void Main()

    {

        Equation e = new Equation(4, 5);

        Console.WriteLine("My equation: {0}", e);

 ////////////////////////////////////////////////////////

        QuadraticEquation qu = new QuadraticEquation(2,4,5);

        double[] results = qu.Solve();

​

        foreach (double x in results)

        {

            Console.WriteLine(x);

        }

    }

}