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 _15_1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void CtoF_Click(object sender, EventArgs e)
        {
            double c = 9 * double.Parse(textboxC.Text) / 5 + 32;
            textboxF.Text = c.ToString();
        }

        private void FtoC_Click(object sender, EventArgs e)
        {
            double f = (double.Parse(textboxF.Text) - 32) * 5 / 9;
            textboxC.Text = f.ToString();
        }
    }
}