四则运算《《《代码封装

设计思路：

       因为TabControl可以设置不同页的选项卡。所以我用它来分页，进行出题，答题设置。然后用savefiledialog保存所出题目。设置两个RichTextBox保存所出题目和出好题后做题时显示的题目。用Count计算做题总数，Right计算做正确的数目。点击结束时弹出Form对话框显示做题情况。

具体实现代码：

Form1.cs

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;
using System.IO;

namespace sum
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
     //   bool bFileName = false;                    //标记文本框内容是否被命名
        string fileName;                           //存储当前文件的名字
        public static int Count = 0;               //计算所做的题数
        public static int Right = 0;               //回答正确的题数
        public static double answer;
        int i;
        public void SaveTofile()                   //保存所出题目的方法
        {
            sfd.InitialDirectory = "C\";               //设置保存默认目录
            sfd.Filter = "txt files(*.txt)|*.txt|all files(*.*)|*.*";
            sfd.FilterIndex = 1;                       //默认保存类型为txt
            sfd.RestoreDirectory = true;
            if (sfd.ShowDialog() == DialogResult.OK)
            {
                richTextBox1.SaveFile(sfd.FileName, RichTextBoxStreamType.PlainText);
               fileName = sfd.FileName;
             //  bFileName = true;
            }
        }
       
        private void button1_Click(object sender, EventArgs e)  //把所出题目保存在txt文档中
        {
            StreamWriter stw1 = File.AppendText("number1.txt");
            stw1.WriteLine(textBox1.Text);
            stw1.Close();
            StreamWriter stw2 = File.AppendText("number2.txt");
            stw2.WriteLine(textBox2.Text);
            stw2.Close();
            StreamWriter stw3 = File.AppendText("number3.txt");
            stw3.WriteLine(textBox3.Text);
            stw3.Close();
            richTextBox1.Text += textBox1.Text + textBox2.Text + textBox3.Text + textBox4.Text + "" + "
";
            textBox1.Clear();
            textBox2.Clear();
            textBox3.Clear();
        }

        private void save_Click(object sender, EventArgs e) //保存
        {
            SaveTofile();
            MessageBox.Show("保存成功！");
           
        }

        private void button2_Click(object sender, EventArgs e)  //打开
        {

            richTextBox2.Text = richTextBox1.Text;
        }

        private void write_Click(object sender, EventArgs e)
        {
            string[] one = new string[100];
            one = File.ReadAllLines("number1.txt");
            textBox5.Text = one[0];
            string[] two = new string[100];
           two = File.ReadAllLines("number2.txt");
            textBox6.Text =two[0];
            string[] three = new string[100];
            three = File.ReadAllLines("number3.txt");
            textBox7.Text = three[0];
           
        }

        private void textBox8_KeyDown(object sender, KeyEventArgs e)
        {
            Class1 cs = new Class1();
            cs.X = double.Parse(textBox5.Text);
            cs.Y = double.Parse(textBox7.Text);
            cs.result = answer;
            string opera = textBox6.Text;
            cs.opera = opera;
            cs.Add();                         //调用Class1的Add方法;
            cs.Min();                        //调用Class1的Min方法;
            cs.Mul();                        //调用Class1的Mul方法;             
            cs.Div();                        //调用Class1的Div方法；
            if (e.KeyCode == Keys.Enter)
            {
                if (textBox8.Text == cs.result.ToString())
                {
                    MessageBox.Show("回答正确");
                    Count++;
                    Right++;
                }
                else
                {
                    MessageBox.Show("回答错误");
                    Count++;
                }
                i++;
                textBox8.Clear();
                string[] one = new string[100];
                one = File.ReadAllLines("number1.txt");
                textBox5.Text = one[i];
                string[] two = new string[100];
                two = File.ReadAllLines("number2.txt");
                textBox6.Text = two[i];
                string[] three = new string[100];
                three = File.ReadAllLines("number3.txt");
                textBox7.Text = three[i];
                if (one.Count() == i)
                {
                    Form2 frm = new Form2();
                    frm.ShowDialog();
                }
            }
        }
        

        private void button4_Click(object sender, EventArgs e)
        {
            Form2 frm2 = new Form2();
            frm2.ShowDialog();
        }

        private void button3_Click(object sender, EventArgs e)   //退出程序
        {
            Application.Exit();
        }

            }
        }


      

Form2.cs

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 sum
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
             textBox1.Text = Form1.Count.ToString();
            textBox2.Text = Form1.Right.ToString();
            textBox3.Text = ((Form1.Right / (double)(Form1.Count)) * 100).ToString() + "%";
        }

    }
}

代码封装：Class1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace sum
{
    class Class1
    {
        private double x;   //定义x变量；
       
        public double X  //封装字段
        {
            get { return x; } 
            set { x = value; }

        }
        private double y;  //定义y变量


        public double Y        //封装字段
        {
            get { return y; }
            set { y = value; }

        }
        public string opera = "";  //运算符号
        public double result;      //计算结果
        public void Add()          //加法
        {
            if (opera == "+")
            {
                result = X + Y;
            }
        }
        public void Min()              //减法
        {
            if (opera == "-")
            {
                result = X - Y;
            }
        }
        public void Mul()             //乘法
        {
            if (opera == "*")
            {
                result = X * Y;
            }
        }
        public void Div()          //除法
        {
            if (opera == "/")
            {
                result = X / Y;
            }
        }
       
    }
}

Form1.cs调用封装代码：

 private void textBox8_KeyDown(object sender, KeyEventArgs e)
        {
            Class1 cs = new Class1();
            cs.X = double.Parse(textBox5.Text);
            cs.Y = double.Parse(textBox7.Text);
            cs.result = answer;
            string opera = textBox6.Text;
            cs.opera = opera;
            cs.Add();                         //调用Class1的Add方法;
            cs.Min();                        //调用Class1的Min方法;
            cs.Mul();                        //调用Class1的Mul方法;             
            cs.Div();                        //调用Class1的Div方法；
            if (e.KeyCode == Keys.Enter)
            {
                if (textBox8.Text == cs.result.ToString())
                {
                    MessageBox.Show("回答正确");
                    Count++;
                    Right++;
                }
                else
                {
                    MessageBox.Show("回答错误");
                    Count++;
                }
                i++;
                textBox8.Clear();
                string[] one = new string[100];
                one = File.ReadAllLines("number1.txt");
                textBox5.Text = one[i];
                string[] two = new string[100];
                two = File.ReadAllLines("number2.txt");
                textBox6.Text = two[i];
                string[] three = new string[100];
                three = File.ReadAllLines("number3.txt");
                textBox7.Text = three[i];
                if (one.Count() == i)
                {
                    Form2 frm = new Form2();
                    frm.ShowDialog();
                }
            }
        }
        

运行过程：

保存所出题目

保存成功

运算

结束运算

总结：

       这次做题虽然遇到很多困难，欣慰的是我还是坚持把它做完了。经过这次编程深感自己平时练习太少，知识面不广，所以我以后要多加练习，多多敲代码。