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 WindowsFormsApp6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public void NumericKey_Click(object sender, EventArgs args)
        {
            Button alpha = sender as Button;

            if (alpha == null) // The typecast failed
                return;        // This... probably shouldn't ever happen anyway

            OutputText.AppendText(alpha.Text);

            if (OutputText.Text.Length > 3) // n,nnn and beyond
            {
                while (OutputText.Text.Contains(','))
                {
                    OutputText.Text = OutputText.Text.Remove(OutputText.Text.IndexOf(','), 1);
                }

                Int64 slacker = Convert.ToInt64(OutputText.Text);
                OutputText.Text = String.Format("{0:#,0}", slacker);
            }
        }

        public void ArithmeticButton_Click(object sender, EventArgs args)
        {
            Button alpha = sender as Button;

            if (alpha == null) // The typecast failed
                return;        // This... probably shouldn't ever happen anyway

            //CurrentExpression.AppendText(alpha.Text + " " + OutputText.Text);

            CurrentExpression.Text = " " + alpha.Text + " " + OutputText.Text + " "+ CurrentExpression.Text;
            OutputText.Text = "";
        }

        private void Clear_Button_Click(object sender, EventArgs e)
        {
            OutputText.Text = "";
            //OutputText.Clear();
        }
    }
}