Form1.cs

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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;
using System.Text.RegularExpressions;
// 下载于www.51aspx.com
namespace Caculator
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
  
        private void btnAdd_Click(object sender, EventArgs e)
        {
            String temp = this.textBox1.Text;
            if ("".Equals(temp))
            {
                temp += "0+";
            }
            else
            {
                char ch = temp.ElementAt(temp.Length - 1);
                if (this.isOperator(ch))
                {
                    temp = temp.Substring(0, temp.Length - 1) + "+";
                }
                else
                {
                    temp += "+";
                }

            }
            this.textBox1.Text = temp;
        }
   
        private void btnSub_Click(object sender, EventArgs e)
        {
            String temp = this.textBox1.Text;
            if ("".Equals(temp))
            {
                temp += "-";
            }
            else
            {
                char ch = temp.ElementAt(temp.Length - 1);
                if (this.isOperator(ch))
                {
                    temp = temp.Substring(0, temp.Length - 1) + "-";
                }
                else
                {
                    temp += "-";
                }