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 && b == 0)

            return ""+c;

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

            return a+"x^2";

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

            return b+"x";   

        else if(a == 0)

            return b+"x+"+c;

        else if(b == 0)

            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 Program

{

    public static void Main()

    {

        Equation e = new Equation(2,4,2);

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

    }

}