using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace lr4
{
    public partial class SUmm : Form
    {
        public SUmm()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void b1_Click(object sender, EventArgs e)
        {
            const double eps = 0.0001;
            double x = Convert.ToDouble(tb1.Text);
            double result = GetSeriesSum(x, eps);
            l4.Text = Convert.ToString(result);
        }
        private static double GetSeriesSum(double x, double e)
        {
            int i = 1;
            double sum = 0, y = 1, lastsum = double.MinValue;
            while (Math.Abs(sum - lastsum) > e)
            {
                lastsum = sum;
                sum += (y *= x / i++);
            }
            return sum;
        }

    }
    }