简易计算器（代码+封装+策略模式）

具体设计思路：
1.先创建一个Windows窗体。
2.添加所需控件，修改相应的属性值。
3.对控件编写代码，使之实现相应的功能。
4.设计出一个四则运算雏形后再根据需求完善代码。
5.进行测试分析。
6.对程序进行PSP耗时分析。

运行结果：

代码如下:

 

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 sizeyunsuan

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        string path = "E:\rtf";

        public static int Count = 0;

        public static int zhengque = 0;

        public static int lefttime;

        public static int time;

        public static int sum;

        int i = 1;

        Class1 mm = new Class1();

        private void Form1_Load(object sender, EventArgs e)

        {

            if (File.Exists(path))

            {

                this.richTextBox1.LoadFile(path, RichTextBoxStreamType.RichText);

                open.Enabled = false;

            }

            save.Enabled = false;

        }

        private void open_Click(object sender, EventArgs e) //打开文件

        {

            OpenFileDialog TxTOpenDialog = new OpenFileDialog();

            TxTOpenDialog.Filter = "RTF文件(*.RTF)|*.RTF";

            if (TxTOpenDialog.ShowDialog() == DialogResult.OK)

            {

                path = TxTOpenDialog.FileName;

                this.richTextBox1.LoadFile(TxTOpenDialog.FileName, RichTextBoxStreamType.RichText);

                save.Enabled = false;

                open.Enabled = false;

                MessageBox.Show("读取成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

            }

        }

 

        private void save_Click(object sender, EventArgs e) //保存文件

        {

            SaveFileDialog TxtSaveDialog = new SaveFileDialog();

            TxtSaveDialog.Filter = "RTF文件(*.RTF)|*.RTF";

            if (File.Exists(path))

            {

 

                this.richTextBox1.LoadFile(path, RichTextBoxStreamType.RichText);

                MessageBox.Show("保存成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

               

                save.Enabled = false;

            }

            else

            {

                if (TxtSaveDialog.ShowDialog() == DialogResult.OK)

                {

 

                    this.richTextBox1.SaveFile(TxtSaveDialog.FileName, RichTextBoxStreamType.RichText);

                    MessageBox.Show("保存成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

                     

                    save.Enabled = false;

                }

            }

        }

 

        private void richTextBox1_TextChanged(object sender, EventArgs e)

        {

            save.Enabled = true;

            if (this.richTextBox1.Text == "" || this.richTextBox1.Text == null)

            {

                open.Enabled = true;

            }

        }

        public void shizi() //录入题目

        {

                left.Text = "";

                fuhao.Text = "";

                right.Text = "";  

        }

        private void open2_Click(object sender, EventArgs e) //打开试题

        {

            OpenFileDialog TxTOpenDialog = new OpenFileDialog();

            TxTOpenDialog.Filter = "RTF文件(*.RTF)|*.RTF";

            if (TxTOpenDialog.ShowDialog() == DialogResult.OK)

            {

                path = TxTOpenDialog.FileName;

                this.richTextBox2.LoadFile(TxTOpenDialog.FileName, RichTextBoxStreamType.RichText);

                save.Enabled = false;

                open.Enabled = false;

                MessageBox.Show("导入成功", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);

            }

        }

 

        private void daoru_Click(object sender, EventArgs e) //导入试题

        {

            richTextBox2.Text = richTextBox1.Text;

        }

 

        private void daan1_Click(object sender, EventArgs e)

        {

            if (daan1.Text == "显示答案")

            {

                daan.PasswordChar = Convert.ToChar(0);

                daan1.Text = "隐藏答案";

            }

            else if (daan1.Text == "隐藏答案")

            {

                daan.PasswordChar = ‘.‘;

                daan1.Text = "显示答案";

 

            }

        }

 

        private void kaishi_Click(object sender, EventArgs e)

        {

 

            string[] ll = new string[100];

            ll = File.ReadAllLines("writer.txt");

            textBox1.Text = ll[0];

 

            string[] lli = new string[100];

            lli = File.ReadAllLines("writer1.txt");

            textBox2.Text = lli[0];

 

            string[] llp = new string[100];

            llp = File.ReadAllLines("writer2.txt");

            textBox3.Text = llp[0];

           

            

            int minute;

            try

            {

                minute = int.Parse(this.shijian.Text);

            }

            catch (System.Exception ex)

            {

                this.shijian1.Text = "输入错误";

                return;

            }

            lefttime = minute;

            this.timer1.Interval = 1000;

            this.timer1.Enabled = true;

            this.timer1.Start();

            

        }

 

        private void timer1_Tick(object sender, EventArgs e)

        {

            if (lefttime <= 0)

            {

                timer1.Enabled = false;

                MessageBox.Show("时间到！");

                Form2 frm2 = new Form2();

                frm2.ShowDialog();

                 

            }

            this.shijian1.Text = "剩余时间" + lefttime.ToString() + "秒";

            lefttime--;

        }

 

        private void jieshu_Click(object sender, EventArgs e)

        {

            Form2 frm2 = new Form2();

            frm2.ShowDialog();

        }

 

        private void button1_Click(object sender, EventArgs e) //下一题

        {

            Count++;

            ti.Text = Count.ToString();

            StreamWriter writer = File.AppendText("writer.txt");

           writer.WriteLine(left.Text);

            writer.Close();

            StreamWriter writer1 = File.AppendText("writer1.txt");

            writer1.WriteLine(fuhao.Text);

            writer1.Close();

            StreamWriter writer2 = File.AppendText("writer2.txt");

            writer2.WriteLine(right.Text);

            writer2.Close();

            richTextBox1.Text += left.Text + fuhao.Text + right.Text + label2.Text + "" + "\n";

            mm.m= int.Parse(left.Text);

            mm.n = int.Parse(right.Text);

            daan.Text = Convert.ToString(mm.c);

            daan.Text += sum + "\r\n";

             

            

            mm.d = Convert.ToChar(fuhao.Text);

            mm.Calue();

         }

        private void textBox4_KeyDown(object sender, KeyEventArgs e)

        {

 

            string m = textBox2.Text;

            int result;

            switch (m)

            {

                case "+":

                    sum = int.Parse(textBox1.Text) + int.Parse(textBox3.Text);

 

                    break;

                case "-":

                    sum = int.Parse(textBox1.Text) - int.Parse(textBox3.Text);

                    break;

                case "*":

                    sum = int.Parse(textBox1.Text) * int.Parse(textBox3.Text);

                    break;

                case "/":

                    sum = int.Parse(textBox1.Text) / int.Parse(textBox3.Text);

                    break;

                default:

                    break;

            }

            if (e.KeyCode == Keys.Enter)

            {

 

                if (int.TryParse(textBox4.Text, out result) == false)

                {

                    MessageBox.Show("请输入数字");

 

                }

                if (textBox4.Text == sum.ToString())

                {

 

                    MessageBox.Show("答对啦！");

                    zhengque++;

 

                }

                else

                {

 

                    MessageBox.Show("答错了，继续加油！");

                }

                

                

                textBox4.Clear();

 

                string[] ll = new string[100];

                ll = File.ReadAllLines("writer.txt");

                textBox1.Text = ll[i];

                string[] lli = new string[100];

                lli = File.ReadAllLines("writer1.txt");

                textBox2.Text = lli[i];

                string[] llp = new string[100];

                llp = File.ReadAllLines("writer2.txt");

                textBox3.Text = llp[i];

                i++;

 

            }

        }

 

        private void button2_Click(object sender, EventArgs e)

        {

            File.WriteAllText("writer.txt", string.Empty);

            File.WriteAllText("writer1.txt", string.Empty);

            File.WriteAllText("writer2.txt", string.Empty);

        }

  

    }

}

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

namespace sizeyunsuan
{
    class Class1
    {
       public string a="";
       public string b="";
       public char d;
       public int m=0;
       public int n = 0;
       public int c = 0;      
       public void Calue()
        {          
            if(d==‘+‘)
            { 
                 c=m+n;
                 a = "";
                 b = "";
                
            }
            if (d == ‘-‘)
            {
               c= m -  n ;
               a = "";
               b = "";
              
              
            }
            if (d == ‘*‘)
            {
              c = m * n;
              a = "";
              b = "";
                }

           if (d == ‘/‘)
            {
               c =m / n;
               a = "";
               b = "";

               }

         }
    }

}