四则运算计算器

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 加减乘除运算
{
    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.Count - (double)(Form1.right)).ToString();
            textBox4.Text = ((Form1.right / (double)(Form1.Count)) * 100).ToString() + "%";
        }
    }
}

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 加减乘除运算
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public static int Count = 0;
        public static int right = 0;

        private void button1_Click(object sender, EventArgs e)
        {
            RandomNum();
        }
        private void RandomNum()
        {
            Random random = new Random();
            int number1, number2;
            number1 = random.Next(1, 11);
            number2 = random.Next(1, 11);
            textBox1.Text = number1.ToString();
            textBox2.Text = number2.ToString();
            textBox3.Text = "";
            Count++;

        }

        private void textBox4_KeyDown(object sender, KeyEventArgs e)
        {
            if (textBox4.Text == "+")
            {
                label1.Text = "+";
                label1.Visible = true;
                textBox4.Text = "加法";

            }
            else if (textBox4.Text == "-")
            {
                label1.Text = "-";
                label1.Visible = true;
                textBox4.Text = "减法";
            }
            
            else if (textBox4.Text == "*")
            {
                label1.Text = "*";
                label1.Visible = true;
                textBox4.Text = "乘法";
            }
            else if (textBox4.Text == "/")
            {
                label1.Text = "/";
                label1.Visible = true;
                textBox4.Text = "除法";
            }
        }

        private void textBox3_KeyDown(object sender, KeyEventArgs e)
        {
            double x;
            if (label1.Text == "+")
            {
                x = double.Parse(textBox1.Text) + double.Parse(textBox2.Text);
            }
            else if (label1.Text == "-")
            {
                x = double.Parse(textBox1.Text) - double.Parse(textBox2.Text);
            }
            else if (label1.Text == "*")
            {
                x = double.Parse(textBox1.Text) * double.Parse(textBox2.Text);
            }
            else
            {
                x = double.Parse(textBox1.Text) / double.Parse(textBox2.Text);

            }
            if (e.KeyCode == Keys.Enter)
            {
                if (textBox3.Text == x.ToString())
                {
                    right++;
                    RandomNum();
                }
                else
                {
                   
                }
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox3.Enabled = true;
            Form2 frm2 = new Form2();
            frm2.ShowDialog();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            new Form3().Show();
        }
    }
}

总结：这次作业有难度，我花了很长时间才做出来，如果有不足之处，望请包涵。