PR6_Treyg/PR6/Form1.cs

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 PR6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int a = Convert.ToInt32(textBox2.Text);
            int b = Convert.ToInt32(textBox1.Text);
            int c = Convert.ToInt32(textBox3.Text);
            if (a < b + c && b < a + c && c < a + b)
            {
                if (a == b && a == c && c == b)
                {
                    label6.Text = "равносторонний";
                    
                }
                else if (a == b || a == c || b == c)
                {
                    label6.Text = "равнобедренный";
                }
                else
                {
                    label6.Text = "разносторонний";
                }
            }
            else
            {
                label6.Text = "треугольник не существует";
            }
        }

        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            char number = e.KeyChar;
            if (!Char.IsDigit(number) && number != 8)
            {
                e.Handled = true;
            }
        }

        private void textBox2_KeyPress(object sender, KeyPressEventArgs e)
        {
            char number = e.KeyChar;
            if (!Char.IsDigit(number) && number != 8)
            {
                e.Handled = true;
            }
        }

        private void textBox3_KeyPress(object sender, KeyPressEventArgs e)
        {
            char number = e.KeyChar;
            if (!Char.IsDigit(number) && number != 8)
            {
                e.Handled = true;
            }
        }
    }
}