LV6 Z1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace trokut
{
    public partial class Form1 : Form
    {
        double a, b, c, opseg, povrsina, s;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            a = Convert.ToDouble(textBox_a_write.Text);
            b = Convert.ToDouble(textBox_b_write.Text);
            c = Convert.ToDouble(textBox_c_write.Text);
            if (c == Math.Sqrt(a * a + b * b) && a == Math.Sqrt(c * c - b * b) && b == Math.Sqrt(c * c - a * a))
                MessageBox.Show("Trokut je pravokutan!");
            else
                MessageBox.Show("Trokut nije pravokutan!");
        }

        private void button_calculate_Click(object sender, EventArgs e)
        {
            try
            {
                a = Convert.ToDouble(textBox_a_write.Text);
                b = Convert.ToDouble(textBox_b_write.Text);
                c = Convert.ToDouble(textBox_c_write.Text);

                if ((a + b) > c && (a + c) > b && (b + c) > a)
                {
                    opseg = a + b + c;
                    s = (a + b + c) / 2;
                    povrsina = Math.Sqrt(s * (s - a) * (s - b) * (s - c));

                    opseg = Math.Round(opseg, 2);
                    povrsina = Math.Round(povrsina, 2);
                    textBox_povrsina_write.Text = Convert.ToString(povrsina);
                    textBox_opseg_write.Text = Convert.ToString(opseg);

                    label2_opseg.Text = Convert.ToString(opseg);
                    label3_povrsina.Text = Convert.ToString(povrsina);
                }
                else
                    MessageBox.Show("Unesene stranice ne tvore trokut.", "Greska!");

            }
            catch
            {
                MessageBox.Show("Upisite neke vrijednosti.", "Greska!");
            }
        }

        private void button1_izlaz_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
    }
}