10

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string path = @"C:\N\input1.txt";
            richTextBox1.LoadFile(path, RichTextBoxStreamType.PlainText);
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            string text = richTextBox1.Text;
            string[] s = text.Split(' ', '\n');
            int[,] a = new int[4,4];
            int k = 0;
            int[] b = new int[4];
            for (int i =0;i<4;++i)
            {
                for (int j = 0;j<4;++j)
                {
                    a[i, j] = int.Parse(s[k]);
                    ++k;
                    b[i] += a[i, j];
                }
            }
            richTextBox2.AppendText("Cуммы строк" + '\n');
            for (int i =0; i<4;++i)
            {
                richTextBox2.AppendText(b[i].ToString() + '\n');
            }

        }
    }
}