Calculation

定义一个Strategy接口，其中定义一个方法，用于计算

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Calculation

{

    interface Interface1

    {

        int calculate(int a, int b);

    }

}

定义具体的算法类，实现Strategy接口，算法类中的算法各自不同：加减乘等

1，加法类

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Calculation

{

    class Add:Interface1

    {

        public int calculate(int a, int b)

        {

            return  a + b;

        }

    }

}

2，减法类

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Calculation

{

    class Subtract : Interface1

    {

        public int calculate(int a, int b)

        {

            return  a - b;

        }

    }

}

3，乘法类

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Calculation

{

    class Multiply:Interface1

    {

        public int calculate(int a, int b)

        {

             return a * b;

        }

    }

}

4，除法类

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Calculation

{

    class Except:Interface1

    {

        public int calculate(int a, int b)

        {

            return  a / b ;

        }

    }

}

定义具体的环境角色

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Calculation

{

    class Environment

    {

        private Interface1 inter;

        public Environment(Interface1 face)

        {

            inter = face;

        }

        public Interface1 gewrt()

        {

            return inter;

        }

        public void setwrt(Interface1 face)

        {

            inter=face;

        }

        public int calculate(int a, int b)

        {

            return inter.calculate(a, b);

        }

    }

}

form1的代码

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace Calculation

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            displays();

        }

        private void displays()

        {

            Random random = new Random();

            int a, b;

            a = random.Next(0, 100);

            b = random.Next(0, 100);

            fasttext.Text = a.ToString();

            lasttext.Text = b.ToString();

            string[] operjact = new string[] { "+", "-", "*", "/" };

            string f = operjact[new Random().Next(0, 4)];

            operja.Text = f;

        }

        private void textBox3_KeyDown(object sender, KeyEventArgs e)

        {

            int a = int.Parse(fasttext.Text);

            int b = int.Parse(lasttext.Text);

            if (e.KeyCode == Keys.Enter)

            {

                int answer = int.Parse(textBox3.Text);

                string OPter=operja.Text;

                switch (OPter)

                {

                    case "+":

                        Add addss = new Add();

                        Environment environment = new Environment(addss);

                        environment.calculate(a, b);

                        if (answer == environment.calculate(a, b))

                        {

                            MessageBox.Show("回答正确！");

                        }

                        else

                        {

                            MessageBox.Show("回答错误！");

                        }

                        break;

                    case "-":

                         Subtract subtrss = new Subtract();

                         Environment environment1 = new Environment(subtrss);

                         environment1.calculate(a,b);

                         if (answer == environment1.calculate(a, b))

                         {

                             MessageBox.Show("回答正确！");

                         }

                         else

                         {

                             MessageBox.Show("回答错误！");

                         }

                       break;

                    case "*":

                       Multiply muli = new Multiply();

                       Environment environment2 = new Environment(muli);

                       environment2.calculate(a, b);

                       if (answer == environment2.calculate(a, b))

                       {

                           MessageBox.Show("回答正确！");

                       }

                       else

                       {

                           MessageBox.Show("回答错误！");

                       }

                       break;

                    case "/":

                       Except except = new Except();

                       Environment enviroment3 = new Environment(except);

                       enviroment3.calculate(a, b);

                        if(answer==enviroment3.calculate(a,b))

                        {

                            MessageBox.Show("回答正确！");

                        }

                        else

                        {

                            MessageBox.Show("回答错误！");

                        }

                       break;

                }

                textBox3.Clear();

                displays();

            }

        }

    }

}

总结：

两个数是让它随机产生的，运算符是随机产生的，无法保证除以零的情况。总的来说这些代码套来套去的有点发晕。不知道自己写的怎么样。

其中有一部分代码不太明白感觉没什么用？

   public Interface1 gewrt()

        {

            return inter;

        }

        public void setwrt(Interface1 face)

        {

            inter=face;

        }

就把他们删了试着运行了一下，还是可以正常运行。