using System;
using System.Windows.Forms;

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

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                int num = Convert.ToInt32(textBox1.Text);
                textBox2.Clear();
                textBox3.Clear();
                if (num < 0)
                {
                    MessageBox.Show("The number of elements in array cannot be less than 0!", "Error");
                    textBox1.Clear();
                }
                else if (num == 0)
                {
                    MessageBox.Show("Your array is empty!", "Error");
                    textBox1.Clear();
                }
                else
                {
                    int[,] arr1 = new int[num, num];
                    Random rand = new Random();
                    for (int i = 0; i < num; i++)
                    {
                        for (int j = 0; j < num; j++)
                        {
                            arr1[i, j] = rand.Next(-10, 10);
                        }
                    }
                    textBox2.Text = "";
                    int rows = arr1.GetUpperBound(0) + 1;
                    int columns = arr1.Length / rows;
                    for (int i = 0; i < rows; i++)
                    {
                        for (int j = 0; j < columns; j++)
                        {
                            textBox2.Text += arr1[i, j] + "t";
                        }
                        textBox2.Text += Environment.NewLine;
                    }

                    double[] arr2 = new double[num];
                    for (int i = 0; i < num; i++)
                    {
                        double sum = 0;
                        for (int j = 0; j < num; j++)
                        {
                            sum += Math.Pow(-1, i + j) * arr1[i, j];
                        }
                        arr2[i] = sum;
                    }

                    textBox3.Text = "";
                    for (int i = 0; i < arr2.Length; i++)
                    {
                        textBox3.Text += arr2[i] + "   ";
                    }
                    textBox1.Clear();
                }
            }
            catch(FormatException)
            {
                MessageBox.Show("The input is improper!", "Error");
                textBox1.Clear();
            }
        }
    } }