SlojnaLihvaKontrolno

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 WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            double A, P, r, n, t;
            try
            {
              P =  Double.Parse(textBox1.Text);
              r = Double.Parse(textBox2.Text);
              n = Double.Parse(textBox3.Text);
              t = Double.Parse(textBox4.Text);
              if (P < 0&&n<0&&t<0&&r<0)
              {
                  MessageBox.Show("Грешка");
                  textBox1.Clear();
                  textBox2.Clear();
                  textBox3.Clear();
                  textBox4.Clear();
                  textBox5.Clear();
              }
              if (radioButton1.Checked)
              {
                  A = P * Math.Pow((1 + r / n), n * t );
                  textBox1.Text = P.ToString();
                  textBox2.Text = r.ToString();
                  textBox3.Text = n.ToString();
                  textBox4.Text = t.ToString();
                  textBox5.Text = A.ToString();
              }
              else
              {
                 if (radioButton2.Checked)
              {
                  A = Double.Parse(textBox5.Text);
                  A = P * (1 + r * t);
                  textBox1.Text = P.ToString();
                  textBox2.Text = r.ToString();
                  textBox3.Text = n.ToString();
                  textBox4.Text = t.ToString();
                  textBox5.Text = A.ToString();

                 }
              }
            }
            catch
            {
                MessageBox.Show("Въведете коректни стойности");
                textBox1.Clear();
                textBox2.Clear();
                textBox3.Clear();
                textBox4.Clear();
                textBox5.Clear();
            }

        }
    }
}