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 () {

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

    }

}

​

public class QuadraticEquation : Equation {

    private int d;

    public int A, B, C;

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

        A = a;

        B = b;

        C = c;

        d = B * B - 4 *A * C;

    }

    public void Solve(){

        if (d > 0) {

            double r1 = (-B + Math.Sqrt(d))/(2*A);

            double r2 = (-B - Math.Sqrt(d))/(2*A);

            Console.WriteLine("Roots: {0},{1}",r1,r2);

        } else if (d == 0) {

            double root = -B/(2*A);

            Console.WriteLine("Double root: {0}",root);

        } else {

            Console.WriteLine("No real roots");

        }

    }

}

​

public class Program

{

    public static void Main()

    {

        QuadraticEquation e = new QuadraticEquation(1 , 5, 3);

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

        e.Solve();

    }

}