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:
tf";
        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 + "" + "
";
            mm.m= int.Parse(left.Text);
            mm.n = int.Parse(right.Text);
            daan.Text = Convert.ToString(mm.c);
            daan.Text += sum + "
";
             
            
            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 = "";

               }

         }
    }

}

策略封装：

using system;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

namespace shuxuefudao

{ 

    public interface ITaxStragety

        {

        int Calcul(int a,int b);

        

        }

   class Class2 : ITaxStragety

    {

       

      public  int Calcul(int a, int b)

        {

            return  a + b;

        }

 

    }

   class sub : ITaxStragety

    {

      public int Calcul(int a, int b)

       {

           return  a - b;

       }

    

   }

   class sheng : ITaxStragety

   {

      public int Calcul(int a, int b)

       {

           return a *b;

                        

       }

    

   }

    class chu : ITaxStragety

   {

     public int Calcul(int a, int b )

       {

           return a / b;

 

       }

   }

   

     class tiaoyong

    {               

         public int c=0;

         public int n=0;

         public void yunsuan(string m)

         {

             if(m=="+")

             {

                 Class2 ss = new Class2();

                 ss.Calcul(c,n);

                                                   

             }

             if(m=="-")

             {

                 sub ww = new sub();

                 ww.Calcul(c,n);

 

                 

             }

             if(m=="*")

             {

                 sheng qq = new sheng();

                 qq.Calcul(c,n);

                            

             }

             if(m=="/")

             {

 

                 chu pp = new chu();

                 pp.Calcul(c,n);

              

             }

          

         }

    }

}

psp耗时分析：

                                                                       PSP耗时分析



 
Personal Software Process Stages
Time(%) Senior Student
Time(h) SDE


Planning
计划
10
6


  .Estimate
  .估计这个任务需要多少时间
30
6


Development
开发
50
15


  .Analysis
  .需求分析
8
6


  .Design Spec
  .生成设计文档
10
5


  .Design Review
  .设计复审（和同事审核设计文档）
5
4


  .Coding Standard
  .代码规范（为目前的开发制定合适的规范）
3
3


  .Design
  .具体设计
20
10


  .Coding
  .具体编码
24
11


Code Review
  .代码复审
7
8