using System;

​

​

public class Equation

{

    private int a, b, c;

    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()

    {

        if (a == 0)

        {

            if (b == 0)

                return c.ToString();

            else if ( c == 0)

                return b + "x";

            else if(b==0 && c == 0)

                return "";

            else

                return  b + "x+" + c;

        }

        else if (b == 0)

        {

            if (c == 0)

                return a + "x^2";

            else

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

        }

        else if (c == 0)

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

        else

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

    }

}

public class QuadraticEquation : Equation

{

    public QuadraticEquation(int a, int b, int c): base (a, b, c)

    {

    }

    public void method(int a, int b, int c)

    {

        Console.WriteLine("{0}",((-b + Math.Sqrt(b*b-4*a*c))/(2*a)));

        Console.WriteLine("{0}",((-b - Math.Sqrt(b*b-4*a*c))/(2*a)));

    }

}

​

public class Program

{

    public static void Main()

    {

        Equation e = new Equation(3,3,0);

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

    }

}