C#仿Win10计算器源码:

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
{
    public partial class Form1 : Form
    {
        double a = 0;
        double b = 0;
        bool c = false;
        string d;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
          
        }

        private void button1_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);
            }

        }
        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

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

            textBox1.Text += "2";

        }

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

            textBox1.Text += "1";

        }

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

            textBox1.Text += "3";
        }

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

            textBox1.Text += "4";
        }

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

            textBox1.Text += "5";
        }

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

            textBox1.Text += "6";
        }

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

            textBox1.Text += "7";
        }

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

            textBox1.Text += "8";
        }

        private void button10_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }

            textBox1.Text += "9";
        }

        private void button11_Click(object sender, EventArgs e)
        {
            if (c == true)
            {
                textBox1.Text = "";
                c = false;
            }

            textBox1.Text += ".";
        }

        private void button13_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "/";

        }

        private void button14_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "x2";

        }

        private void button15_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "*";

        }

        private void button16_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "sqrt";

        }

        private void button17_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "-";

        }

        private void button18_Click(object sender, EventArgs e)
        {
            c = true;
            b = double.Parse(textBox1.Text);
            d = "+";

        }

        private void button12_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
           
        }

        private void button19_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 * double.Parse(textBox1.Text);
                    break;
                case "sqrt":
                    a = Math.Sqrt(b);
                    break;
            }

            textBox1.Text = a + "";

            c = true;
        }
    }
 }

运行结果:

最后

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