using System;

public class Program

{

    public static void Main()

    {

        Triangle triangle1 = new Triangle();

        Triangle triangle2 = new Triangle

        {

            A = 2.0,

            B = 3,

            C = 5,

            COLOR = "Blue"

        };

        Triangle triangle3 = new Triangle(11);

        Triangle triangle4 = new Triangle("Red");

        Console.WriteLine("Print triangle1: ");

        triangle1.Print();

        triangle1.GetS();

        Console.WriteLine("Print triangle2: ");

        triangle2.Print();

        triangle2.GetS();

    }

}

class Triangle

{

    private double a, b, c;

    private string color;

    public double A

    {

        get{return this.a;}

        set{this.a = value;}

    }

    public double B

    {

        get{return this.b;}

        set{this.b = value;}

    }

    public double C

    {

        get{return this.c;}

        set{this.c = value;}

    }

    public string COLOR

    {

        get{return this.color;}

        set{this.color = value;}

    }

    public Triangle()

    {

        this.a = 10;

        this.b = 10;

        this.c = 10;

        this.color = "Blue";

    }

    public Triangle(double a):this()

    {

        this.a = a;

    }

    public Triangle(double a, double b)

    {

        this.c = 10;

        this.color = "Blue";

    }

    public Triangle(string color):this()

    {

        this.color = color;

    }

    public void Print()

    {

        Console.WriteLine(a);

        Console.WriteLine(b);

        Console.WriteLine(c);

        Console.WriteLine(color);

        Console.WriteLine(Check());

        if(Check() == true)

        {

            Console.WriteLine(GetS());

        }

    }

    public bool Check()

    {

        bool check = true;

        if(a <= 0 || b <= 0 || c <= 0)

        {

            check = false;

        }

        if(a >= (b + c))

        {

            check = false;

        }

        if(b >= (a + c))

        {

            check = false;

        }

        if(c >= (a + b))

        {

            check = false;

        }

        return check;

    }

    public double GetS()

    {

        double p = (a + b + c) / 2;

        double s = Math.Sqrt((p - a) * (p - b) * (p - c));

        return s;

    }

}