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;

namespace MyComputer
{
public partial class Form1 : Form
{
//HasDot表示有没有小数点,false位默认值，表示没有
bool HasDot = false;

    //HasOption表示有没有选择运算符，默认是没有的falsebool HasOption = false;string Option ;//存储第一个运算或者存储上一次运算的结果decimal OptionNumber = 0;public Form1(){InitializeComponent();}private void btnZero_Click(object sender, EventArgs e){OptionNumber = Convert.ToDecimal(txtResult.Text);if (HasDot || OptionNumber!=0)txtResult.Text = txtResult.Text + "0";}private void btnZero_CursorChanged(object sender, EventArgs e){}private void btnDot_Click(object sender, EventArgs e){if (HasDot == false){HasDot = true;txtResult.Text = txtResult.Text + ".";}}private void btnBackSpace_Click(object sender, EventArgs e){MessageBox.Show("你好！");}private void btnTwo_Click(object sender, EventArgs e){txtResult.Text = txtResult.Text + "2";}private void btnOne_Click(object sender, EventArgs e){Button btnNumber = (Button)sender;//看当前的值是不是0，还有打没打小数点if (Convert.ToDecimal(txtResult.Text) == 0 && HasDot ==false){txtResult.Text = btnNumber.Text;}elsetxtResult.Text = txtResult.Text + btnNumber.Text;}private void btnClear_Click(object sender, EventArgs e){txtResult.Text = "0";//重置文本框HasDot = false; //重置小数点}private void btnAdd_Click(object sender, EventArgs e){//存储第一个运算数OptionNumber = Convert.ToDecimal(txtResult.Text);//存储运算符Option = ((Button)sender).Text;//准备输入第二个运算数txtResult.Text = "0";//重置文本框HasDot = false; //重置小数点}private void btnResult_Click(object sender, EventArgs e){if (Option.Equals("+")){//MessageBox.Show("相等");txtResult.Text = (OptionNumber + Convert.ToDecimal(txtResult.Text)).ToString();}else if (Option.Equals("-")){//运算符号为-txtResult.Text = (OptionNumber - Convert.ToDecimal(txtResult.Text)).ToString();}else if (Option.Equals("*")){//运算符号为*txtResult.Text = (OptionNumber * Convert.ToDecimal(txtResult.Text)).ToString();}else if (Option.Equals("/")){//运算符号为///除数不能为0if (Convert.ToDecimal(txtResult.Text).Equals(0)){txtResult.Text = "error!除数不能为0";}elsetxtResult.Text = (OptionNumber / Convert.ToDecimal(txtResult.Text)).ToString();}}private void Form1_Load(object sender, EventArgs e){}}

}