c#做四则运算小程序

 如果，此时的你，依旧没有开学；

恰巧可能还要辅导作业，

然后都是些小学生，

那么可以的话，你就试着做一个小程序。

以下用c#做的一个窗体程序，内容简单，功能凑合

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 WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        int a, b;

        string op;

        int result;
        Random rnd = new Random();

        private void Form1_Load(object sender, EventArgs e)
        {

        }


        private void BtnNew_Click(object sender, EventArgs e)
        {

            a = rnd.Next(9) + 1;

            b = rnd.Next(9) + 1;

            int c = rnd.Next(4);

            switch (c)

            {

                case 0: op = "+"; result = a + b; break;

                case 1: op = "-"; result = a - b; break;

                case 2: op = "*"; result = a * b; break;

                case 3: op = "/"; result = a / b; break;

            }

            lblA.Text = a.ToString();

            lblB.Text = b.ToString();

            lblOp.Text = op;

            txtAnswer.Text = "";

        }

        private void BtnJudge_Click(object sender, EventArgs e)
        {
            string str = txtAnswer.Text;

            double d = double.Parse(str);

            string disp = "" + a + op + b + "=" + str + " ";

            if (d == result) // if( Math.Abs(d-result)< 1e-3 )

                disp += "√  答案正确 ";

            else

                disp += "╳  答案错误 ";



            lstDisp.Items.Add(disp);
        }
    }
}