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 km_to_mt_cm
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
            private void button1_Click(object sender, EventArgs e)
            {               
                Double Kilometer , Meter , Centimetre;

                Kilometer = Convert.ToDouble(textBox1.Text);

                Meter = Kilometer * 1000;
                Centimetre = Meter * 100;

                textBox2.Text = Meter.ToString();
                textBox3.Text = Centimetre.ToString(); 
            }   
        }
    }