自动出题判分——c#学习实践

1、程序功能自动出题—（程序随意给出10以内加减乘除）并且判断结果正确与否，正确打对勾，错误打错号。

2、设计界面：

3、代码：

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 text01

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        int a, b;

        string op;

        int result;

        Random rnd = new Random();

        private void btnNew_Click(object sender, EventArgs e)

        {   //随机产生A\B

            a = rnd.Next() + ;

            b = rnd.Next() + ;

            int c = rnd.Next();

            switch (c)//运算符由随机给出的数字对应给出

            {

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

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

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

                case : 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 += "√";

            else

                disp += "X";

            lstDisp.Items.Add(disp);

        }

    }

}

4、运行成果图：