四个整数运算

1.计算类

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


namespace 封装1
{
    public class Calcuater
    {
        private int numberA;
        private int numberB;
        public int NumberA
        {
            get { return numberA; }
            set {numberA=value;}
        }
        public int NumberB
        {
            get
            {
                return numberB;
            }
            set
            {
                numberB = value;
            }
        }
        public virtual int getresult()
        {
            int result=0;
            return result;
        }
    }
    public class Add : Calcuater
    {
        public override int getresult()
        {
            int result = 0;
            result = NumberA + NumberB;
            return result;
        }


    }
    public class Sub : Calcuater
    {
        public override int getresult()
        {
            int result = 0;
            result = NumberA - NumberB;
            return result;
        }

    }
    public class Mul : Calcuater
    {
        public override int getresult()
        {
            int result = 0;
            result = NumberA * NumberB;
            return result;
        }
    }
    public class Div : Calcuater
    {
        public override int getresult()
        {
            int result = 0;
            if (NumberB == 0)
            {
                throw new Exception("除数不能为零！");
            }
            else
            {
                result = NumberA / NumberB;
            }
            return result;
        }
    }
}

 2.定义环境

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

namespace 封装1
{
    class factory
    {
        public static Calcuater create(string operte)
        {
            Calcuater oper=null;
            switch (operte)
            {
                case "+":
                    oper = new Add();
                    break;
                case "-":
                    oper = new Sub();
                    break;
                case "*":
                    oper = new Mul();
                    break;
                case "/":
                    oper = new Div();
                    break;


            }
            return oper;
        }
    }
}

 3.form设计

4.form1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 封装1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        int rest;
        private void Form1_Load(object sender, EventArgs e)
        {
            chuti();
        }

        private void textBox3_KeyDown(object sender, KeyEventArgs e)
        {
            int a =int.Parse( textBox1.Text);
            int b = int.Parse(textBox2.Text);
            int c = int.Parse(textBox4.Text);
            int d = int.Parse(textBox5.Text);
            string f = label1.Text;
            string h = label2.Text;
            string o = label3.Text;
         
            if (e.KeyCode == Keys.Enter)
            {
                if ( h=="/"||h=="*")
                {
                    Calcuater calas = factory.create(h);
                    calas.NumberA = b;
                    calas.NumberB = c;
                    int re = calas.getresult();
                    if (f == "*" || f == "/")
                    {
                        calas = factory.create(f);
                        calas.NumberA = a;
                        calas.NumberB = re;
                        int re1 = calas.getresult();
                        calas = factory.create(o);
                        calas.NumberA = re1;
                        calas.NumberB = d;
                        rest = calas.getresult();
 
                    }
                    if (o == "*" || o == "/")
                    {
                        calas = factory.create(o);
                        calas.NumberA = d;
                        calas.NumberB = re;
                        int re1 = calas.getresult();
                        calas = factory.create(f);
                        calas.NumberA = re1;
                        calas.NumberB = a;
                        rest = calas.getresult();
 
                    }
 
                }
              
               
                if ( h == "+" || h == "-")
                {
                    Calcuater calas = factory.create(f);
                    calas.NumberA = a;
                    calas.NumberB = b;
                    int re = calas.getresult();
                    calas = factory.create(o);
                    calas.NumberA = c;
                    calas.NumberB = d;
                    int re1 = calas.getresult();
                    calas = factory.create(h);
                    calas.NumberA = re;
                    calas.NumberB = re1;
                    rest = calas.getresult();
                    
                }
               
                if (textBox3.Text == rest.ToString())
                    {
                        MessageBox.Show("回答正确！");
                    }
                    else
                    {
                        MessageBox.Show("回答错误！");
                        MessageBox.Show(rest.ToString());

                    }
                textBox3.Clear();
                chuti();
 
            }
            
        }

        private void chuti()
        {
            Random random = new Random();
            textBox1.Text = random.Next(0, 100).ToString();
            textBox2.Text = random.Next(0, 100).ToString();
            textBox4.Text = random.Next(0, 100).ToString();
            textBox5.Text = random.Next(0, 100).ToString();
            string[] operte = new string[] { "+", "-", "*", "/" };
            label1.Text = operte[new Random().Next(0, 4)];
            string[] operte1 = new string[] { "-", "*", "+", "/" };
            label2.Text = operte1[new Random().Next(0, 4)];
            string[] operte2 = new string[] { "*", "-", "/", "+" };
            label3.Text = operte2[new Random().Next(0, 4)];

        }
    }
}

 5.运行结果

6.总的来说还是有些问题遇到不能整除的书会默认取模。导致在除数运算时可能会出现除以零的情况。