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

namespace calculator
{
  public partial class Form1 : Form
  {
    public Form1()
    {
        InitializeComponent();
    }
   double total = 0;
   double total1=0;
   bool plusclicked = false;
   bool minusclicked = false;
   bool divideclicked = false;
   bool multiplyclicked = false;
    private void one_Click(object sender, EventArgs e)
    {
      result.Text = result.Text + one.Text;
    }
    private void two_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + two.Text;
    }
    private void three_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + three.Text;
    }
    private void four_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + four.Text;
    }
    private void five_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + five.Text;
    }
    private void six_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + six.Text;
    }
    private void seven_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + seven.Text;
    }
    private void eight_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + eight.Text;
    }
    private void nine_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + nine.Text;
    }
    private void zero_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + zero.Text;
    }
    private void point_Click(object sender, EventArgs e)
    {
        result.Text = result.Text + point.Text;
    }
    private void clear_Click(object sender, EventArgs e)
    {
        result.Clear();
        total = 0;
        total1 = 0;
        plusclicked = false;
        minusclicked = false;
        divideclicked = false;
        multiplyclicked = false;
    }
    private void plus_Click(object sender, EventArgs e)
    {
        total = total + double.Parse(result.Text);
        result.Text="";
        plusclicked = true;
        minusclicked = false;
        divideclicked = false;
        multiplyclicked = false;
    }
    private void equal_Click(object sender, EventArgs e)
    {
        if (plusclicked == true)
        {
            total1 = total + double.Parse(result.Text);
        }
        if (minusclicked == true)
        {
            total1 = total - double.Parse(result.Text);
        }
        if (divideclicked == true)
        {
            total1 = total / double.Parse(result.Text);
        }
        if (multiplyclicked == true)
        {
            total1 = total * double.Parse(result.Text);
        }
        result.Text = total1.ToString();
        total = 0;
    }
    private void minus_Click(object sender, EventArgs e)
    {
        if (total!=0)
        {
            total = total1 - double.Parse(result.Text);
        }
        else
        {
            total = total + double.Parse(result.Text);
        }
        result.Clear();
        plusclicked = false;
        minusclicked = true;
        multiplyclicked = false;
        divideclicked = false;
    }
   private void divide_Click(object sender, EventArgs e)
    {
        if (total != 0)
        {
            total = total1 / double.Parse(result.Text);
        }
        else
        {
            total = total + double.Parse(result.Text);
        }
        result.Clear();
        plusclicked = false;
        minusclicked = false;
        multiplyclicked = false;
        divideclicked = true;
    }
    private void multiply_Click(object sender, EventArgs e)
    {
        if (total != 0)
        {
            total = total1 * double.Parse(result.Text);
        }
        else
        {
            total = total + double.Parse(result.Text);
        }
        result.Clear();
        plusclicked = false;
        minusclicked = false;
        multiplyclicked = true;
        divideclicked = false;
    }
}
}