c#实现简易计算器

1.进入vs,按图创建项目

2.点击确定后出现form窗体，左侧有工具箱

将里边的Button和TextBox拖拽到form窗体，textbox是计算器数字输入输出的地方，拖拽一个就行，button的数量按自己的计算器要实现功能来确定

这是我要做的界面，所以拖拽了20个button，我的button从 +/-开始向右加1
对应的2是button6
对应x²是button18

（修改button的样式在vs的右下角，如果不清楚怎么改去网上搜一下，但是建议大家不要不要不要在现在就调整背景色，字体，或者改button里边的内容，先写代码，最后回来设计样式）
3 代码（双击窗体或者右击查看代码）
注意代码和窗体名称的匹配，如果你的button顺序和我的一致，那么代码就可以直接用了。如果不匹配，在右下角属性这里把click名字改一下，比如你的2对应的是button14按钮，那么把click这里名字改成我上边图示的button6_click，效果就和我的一样了

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 计算器实验1
{
public partial class Form1 : Form
{
double first = 0;
double last = 0;
double result = 0;
bool c = false;
string d= “”;

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        textBox1.Text = "0";
    }





    private void button2_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "0";
    }

    private void button3_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }
        textBox1.Text += ".";
    }



    private void button5_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "1";
    }

    private void button6_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "2";
    }

    private void button7_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "3";
    }



    private void button9_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "4";
    }

    private void button10_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "5";
    }

    private void button11_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "6";
    }


    private void button13_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "7";
    }

    private void button14_Clic(object sender, EventArgs e)
    {

        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "8";
    }

    private void button15_Click(object sender, EventArgs e)
    {
        if (c == true)

        {

            textBox1.Text = "";

            c = false;

        }

        textBox1.Text += "9";
    }
    private void button20_Click(object sender, EventArgs e)// /
    {
        c = true;
        first = double.Parse(textBox1.Text);
        d = "/";
    }
    private void button16_Click(object sender, EventArgs e) //*
    {
        c = true;
        first = double.Parse(textBox1.Text);
        d = "*";
    }

    private void button12_Click(object sender, EventArgs e) //-
    {
        if (textBox1.Text == "0")
            textBox1.Text = "-";
        else {
            c = true;
            first = double.Parse(textBox1.Text);
            d = "-";
        }

    }

    private void button8_Click(object sender, EventArgs e) //+
    {
        c = true;
        first = double.Parse(textBox1.Text);
        d = "+";
    }
    private void button1_Click(object sender, EventArgs e) //取反
    {
        if (double.Parse(textBox1.Text) > 0)
            textBox1.Text = "-" + textBox1.Text;
        else if(double.Parse(textBox1.Text)<0)
                textBox1.Text = -double.Parse(textBox1.Text) + "";
     
    }
    private void button17_Click(object sender, EventArgs e)   //C
    {
        textBox1.Text = "";
        first = 0;
        last = 0;
        result = 0;
        d = "";
        c = false;
    }

    private void button4_Click(object sender, EventArgs e) //=
    {
        switch (d)
        {
            case "+":result = first + double.Parse(textBox1.Text);break;
            case "-": result = first - double.Parse(textBox1.Text); break;
            case "*": result = first * double.Parse(textBox1.Text); break;
            case "/": result = first / double.Parse(textBox1.Text); break;
            case "x²":
                if (first != 0) result = first * first;
                else if (double.Parse(textBox1.Text) != 0) result = last * last;
                break;
            case "√X":
                 if (first != 0) result = Math.Sqrt(first); 
                else if (double.Parse(textBox1.Text) != 0) result = Math.Sqrt(last); 
                break;
        }
        textBox1.Text = result+"";
            
    }
    private void button18_Click(object sender, EventArgs e) //平方
    {
        c = true;
        first = double.Parse(textBox1.Text);
        d = "x²";
    }

    private void button19_Click(object sender, EventArgs e) //开根号
    {
        c = true;
        first = double.Parse(textBox1.Text);
        d = "√X";
    }


}

}

有其他问题给我留言吧，虽然我啥也不会，hiahiahiahia~~~