.NET——编写一个计算器

计算器.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace NetExercise3
{
    public partial class 计算器 : Form
    {
        double a = 0;
        double b = 0;
        bool c = false;
        string d;

        public 计算器()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "1";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "2";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "3";
        }

        private void button4_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "4";
        }

        private void button5_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "5";
        }

        private void button6_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "6";
        }

        private void button7_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "7";
        }

        private void button8_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "8";
        }

        private void button9_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "9";
        }

        private void button0_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }
            textBox1.Text += "0";
            if (d == "/")
            {
                textBox1.Clear();
                MessageBox.Show("除数不能为零", "错误提示", MessageBoxButtons.OK,
           MessageBoxIcon.Warning);
            }
            if (d == "log")
            {
                textBox1.Clear();
                MessageBox.Show("指数不能为零", "错误提示", MessageBoxButtons.OK,
           MessageBoxIcon.Warning);
            }
            if (d == "ln")
            {
                textBox1.Clear();
                MessageBox.Show("指数不能为零", "错误提示", MessageBoxButtons.OK,
           MessageBoxIcon.Warning);
            }

        }

        private void buttonC_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            d = "";
        }

        private void buttonA_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "+";
        }

        private void buttonJ_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "-";
        }

        private void buttonM_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "*";
        }

        private void buttonY_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "/";
        }

        private void buttonD_Click(object sender, EventArgs e)
        {
            switch (d)
            {
                case "+": a = b + double.Parse(textBox1.Text); break;
                case "-": a = b - double.Parse(textBox1.Text); break;
                case "*": a = b * double.Parse(textBox1.Text); break;
                case "/": a = b / double.Parse(textBox1.Text); break;
                case "X2": a = b*b; break;
                case "sqrt": a = Math.Sqrt(b); break;
                case "log": a = Math.Log10(b); break;
                case "ln": a = Math.Log(b); break;
            }
            textBox1.Text = a + "";
            c = true;
        }

        private void buttonX2_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "X2";
        }

        private void buttonS_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "sqrt";
        }

        private void buttonLog_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "log";
        }

        private void buttonLn_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "ln";
        }

        private void 计算器_Load(object sender, EventArgs e)
        {

        }
    }
}

 计算器.cs设计：