WindowsFormsApp1/calculator.cs

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//计算器
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 WindowsFormsApp1
{
    public partial class calculator : Form
    {
        public calculator()
        {
            InitializeComponent();
        }

        //计算器
        public double temp = 0;//存储临时数据
        public string operation =null;//判断之前按的是+-*/中的哪个
        public double result = 0;//存储计算结果
        public double number = 0;//存储输入的数字
        public bool flag = true;//判断能否输入第二个数字
        private void calculator_Load(object sender, EventArgs e)
        {

        }

        

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void One_Click(object sender, EventArgs e)
        {
            if (operation != null) 
            {
                if (!flag) 
                {
                    textBox1.Text = ""; 
                    flag = true; 
                }
                
            }
            if(flag)
                textBox1.Text += "1";
        }

        private void Two_Click(object sender, EventArgs e)
        {
            if (operation != null)
            {
                if (!flag)
                {
                    textBox1.Text = "";