using System;

​

public class Program

{

    public static void Main()

    {

        double a = GetDoubleValueFromUser("A");

        double b = GetDoubleValueFromUser("B");

        double c = GetDoubleValueFromUser("C");

​

        if (a == -100 || b == -100 || c == -100)

        {

            Console.WriteLine("Podano błędne wartości!");

            Console.ReadLine();

            return;

        }

        else if(!CheckIfTriangle(a,b,c))

        {

            Console.WriteLine("Podane wartości nie tworzą trójkąta!");

            Console.ReadLine();

            return;

        }

​

        Triangle trk = new Triangle(a, b, c);

​

        trk.CalcTrianglePerimeter();

        trk.CalcTriangleArea();

        trk.CalcTriangleHeight();

        trk.CalcTriangleType();

        Console.WriteLine(trk.ToString());

        Console.ReadLine();

​

    }

​

    private static double GetDoubleValueFromUser(string pointName)

    {

        double point;

​

        Console.WriteLine("Podaj bok " + pointName + ": ");

        string line = Console.ReadLine();

​

        if(double.TryParse(line, out point))

        {

            return point;

        }

        return -100;

    }

    private static bool CheckIfTriangle(double a, double b, double c)

    {

        return (a + b) > c && (a + c) > b && (b + c) > a;

    }

}

​

public class Triangle 

{

    public double SideA { get { return a; } }

    public double SideB { get { return b; } }

    public double SideC { get { return c; } }

​

    private double a;

    private double b;

    private double c;

​

​

    public double Height { get { return height; } }

    public double Area { get { return area; } }

    public TriangleType Type { get { return type; } }

    public double Perimeter { get { return perimeter; } }

​

    private double height;

    private double area;

    private TriangleType type;

    private double perimeter;

​

    public Triangle(double a, double b, double c)

    {

        this.a = a;

        this.b = b;

        this.c = c;

    }

​

    public void CalcTrianglePerimeter()

    {

        perimeter = a + b + c;

    }

​

    public void CalcTriangleArea()

    {

        area = (Math.Sqrt((a + b + c) * (a + b - c) * (a - b + c) * (-a + b + c)) / 4);

    }

​

    public void CalcTriangleHeight()

    {

        height = ((2 * area)/a);

    }

​

    public void CalcTriangleType()

    {

        if(((Math.Pow(a, 2)) + (Math.Pow(b, 2))) == (Math.Pow(c, 2)))

        {

            type = TriangleType.RIGHT;

        }

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

        {

            type = TriangleType.EQUILATERAL;

        }

        else if (a == b || a == c || c == b)

        {

            type = TriangleType.ISOSCELES;

        }

        else if (a != b && b != c && c != a)

        {

            type = TriangleType.SCALENE;

        }

        else

        {

            type = TriangleType.UNKNOWN;

        }

    }

​

    public override string ToString()

    {

        return "Trójkąt " + GetTriangleTypeString() + ", o bokach a: " + a + " b: " + b + " c: " + c + Environment.NewLine + "Pole: " + area + Environment.NewLine + "Obwód: " + perimeter + Environment.NewLine + "Wysokość: " + height;

    }

​

    private string GetTriangleTypeString()

    {

        switch (type)

        {

            case TriangleType.EQUILATERAL:

                return "równoboczny";

            case TriangleType.RIGHT:

                return "prostokątny";

            case TriangleType.ISOSCELES:

                return "równoramienny";

            case TriangleType.SCALENE:

                return "różnoboczny (ostrokątny lub rozwartokątny)";

            default:

                return "niezdefiniowany";

        }

    }

}

public enum TriangleType

{

    EQUILATERAL,    // równoboczny

    RIGHT,          // prostokątny

    ISOSCELES,      // równoramienny

    SCALENE,        // różnoboczny

    ACUTE,          // ostrokątny

    OBTUSE,         // rozwartokątny

    UNKNOWN         // niezdefiniowany

}