小算盤基本版

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 WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        int x,y,z;
        Boolean a = false;
        Boolean b = false;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.Text = "";
            button1.Text = "0";
            button2.Text = "00";
            button3.Text = "=";
            button4.Text = "1";
            button5.Text = "2";
            button6.Text = "3";
            button7.Text = "4";
            button8.Text = "5";
            button9.Text = "6";
            button10.Text = "7";
            button11.Text = "8";
            button12.Text = "9";
            button13.Text = "+";
            button14.Text = "-";
            button15.Text = "*";
            button16.Text = "/";
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (a == false)
            {
            }
            else
            {  
                textBox1.Text += 0;
            }
        }
        private void button4_Click(object sender, EventArgs e)
        {
            textBox1.Text += 1;
            a = true;
        }
        private void button5_Click(object sender, EventArgs e)
        {
            textBox1.Text += 2;
            a = true;
        }
        private void button6_Click(object sender, EventArgs e)
        {
            textBox1.Text += 3;
            a = true;
        }
        private void button7_Click(object sender, EventArgs e)
        {
            textBox1.Text += 4;
            a = true;
        }
        private void button8_Click(object sender, EventArgs e)
        {
            textBox1.Text += 5;
            a = true;
        }
        private void button9_Click(object sender, EventArgs e)
        {
            textBox1.Text += 6;
            a = true;
        }
        private void button10_Click(object sender, EventArgs e)
        {
            textBox1.Text += 7;
            a = true;
        }
        private void button11_Click(object sender, EventArgs e)
        {
            textBox1.Text += 8;
            a = true;
        }
        private void button12_Click(object sender, EventArgs e)
        {
            textBox1.Text += 9;
            a = true;
        }
        private void button16_Click(object sender, EventArgs e)
        {
            if (b == true)
            {
            }
            else
            {
                x = int.Parse(textBox1.Text);
               
                textBox1.Text = "";
                a = false;
                b = true;
            }
        }
        private void button3_Click(object sender, EventArgs e)
        {
            if (a == true & b == true)
            {
                y = int.Parse(textBox1.Text);
                z = x / y;
                textBox1.Text=""+z;
            }
        }
    }
}