commit_2/Volkova/Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics.Eventing.Reader;
using System.Drawing;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;
using BaseCalculator;

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

        private void button1_Click(object sender, EventArgs e)
        {

        }

        private void button4_Click(object sender, EventArgs e)
        {
            textBox1.Text += "/";
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button13_Click(object sender, EventArgs e)
        {
            textBox1.Text += "1";

        }

        private void button14_Click(object sender, EventArgs e)
        {
            textBox1.Text += "2";
        }

        private void button15_Click(object sender, EventArgs e)
        {
            textBox1.Text += "3";
        }

        private void button9_Click(object sender, EventArgs e)
        {
            textBox1.Text += "4";
        }

        private void button10_Click(object sender, EventArgs e)
        {
            textBox1.Text += "5";
        }

        private void button11_Click(object sender, EventArgs e)
        {
            textBox1.Text += "6";
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            textBox1.Text += "7";
        }

        private void button6_Click(object sender, EventArgs e)
        {
            textBox1.Text += "8";
        }

        private void button7_Click(object sender, EventArgs e)
        {
            textBox1.Text += "9";
        }

        private void button17_Click(object sender, EventArgs e)
        {
            textBox1.Text += "0";
        }

        private void button16_Click(object sender, EventArgs e)
        {
            textBox1.Text += "+";
        }

        private void button12_Click(object sender, EventArgs e)
        {
            textBox1.Text += "-";
        }

        private void button19_Click(object sender, EventArgs e)
        {
            try
            {
                string expression = textBox1.Text;
                if (expression.Contains("+"))
                {
                    string[] parts = expression.Split('+');

                    if (parts.Length == 2)
                    {
                        long a = long.Parse(parts[0]);
                        long b = long.Parse(parts[1]);

                        int result = CalcClass.Add(a, b);

                        textBox2.Text = result.ToString();
                    }
                }
                

                else if (expression.Contains("-"))
                {
                    string[] parts = expression.Split('-');

                    if (parts.Length == 2)
                    {
                        long a = long.Parse(parts[0]);
                        long b = long.Parse(parts[1]);

                        int result = CalcClass.Sub(a, b);

                        textBox2.Text = result.ToString();
                    }
                }

                else if (expression.Contains("*"))
                {
                    string[] parts = expression.Split('*');

                    if (parts.Length == 2)
                    {
                        long a = long.Parse(parts[0]);
                        long b = long.Parse(parts[1]);

                        int result = CalcClass.Mult(a, b);

                        textBox2.Text = result.ToString();
                    }
                }

                else if (expression.Contains("/"))
                {
                    string[] parts = expression.Split('/');

                    if (parts.Length == 2)
                    {
                        long a = long.Parse(parts[0]);
                        long b = long.Parse(parts[1]);

                        int result = CalcClass.Div(a, b);

                        textBox2.Text = result.ToString();
                    }
                }

                else
                {
                    textBox2.Text = "Ошибка: неверный формат выражения";
                }
            }
            catch (Exception ex)
            {
                textBox2.Text = $"Ошибка: {ex.Message}";
            }
           
        }

        private void button8_Click(object sender, EventArgs e)
        {
            textBox1.Text += "*";
        }

        private void button5_Click(object sender, EventArgs e)
        {
            if (!String.IsNullOrEmpty(textBox1.Text))
            {
                textBox1.Text = textBox1.Text.Substring(0, textBox1.Text.Length - 1);
            }
        }
    }
    }