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   源码介绍

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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 Calculator
{
    public partial class Form1 : Form
    {
        string str, opp, opp1;
        double num1, num2, result;
        public Form1()
        {
            InitializeComponent();
        }
        private void number(object sender, EventArgs e)
        {
            Button b = (Button)(sender);
            str = b.Text;
            if (txtOutput.Text == "0")
            {
                txtOutput.Text = str;
            }
            else
                txtOutput.Text = txtOutput.Text   str;
        }
        private void operator1(object sender, EventArgs e)
        {
            Button b = (Button)(sender);
            if (b.Text == " ")
            {
                num1 = double.Parse(txtOutput.Text);
                txtOutput.Text = "";
                opp = " ";
                opp1 = "";
            }
            else if (b.Text == "-")
            {
                num1 = double.Parse(txtOutput.Text);
                txtOutput.Text = "";
                opp = "-";
                opp1 = "";
            }
            else if (b.Text == "*")
            {
                num1 = double.Parse(txtOutput.Text);
                txtOutput.Text = "";
                opp = "*";
                opp1 = "";
            }
            else if (b.Text == "/")
            {
                num1 = double.Parse(txtOutput.Text);
                txtOutput.Text = "";
                opp = "/";
                opp1 = "";
            }
            else if (b.Text == "=")
            {
                if (opp1 != "=")
                {
                    num2 = double.Parse(txtOutput.Text);
                }
                if (opp == " ")
                {
                    num1 = num1   num2;
                    txtOutput.Text = ""   num1.ToString();
                }
                else if (opp == "-")
                {
                    num1 = num1 - num2;
                    txtOutput.Text = ""   num1.ToString();
                }
                else if (opp == "*")
                {
                    num1 = num1 * num2;
                    txtOutput.Text = ""   num1.ToString();
                }
                else if (opp == "/")
                {
                    if (num2 == 0)
                    {
                        txtOutput.Text = "除数不能为零";
                    }
                    else
                    {
                        num1 = num1 / num2;
                        txtOutput.Text = ""   num1.ToString();
                    }
                }
                opp1 = "=";
            }
        }
        private void operator2(object sender, EventArgs e)
        {
            Button b = (Button)(sender);
            if (b.Text == ".")
            {
                str = txtOutput.Text;
                int index = str.IndexOf(".");
                if (index == -1)
                {
                    txtOutput.Text = str   ".";
                }
            }
            else if (b.Text == "退格<--")
            {
                if (txtOutput.Text != "")
                {
                    str = txtOutput.Text;
                    str = str.Substring(0, str.Length - 1);
                    txtOutput.Text = str;
                }
            }
            else if (b.Text == "CE")
            {
                txtOutput.Text = "0";
            }
            else if (b.Text == "C")
            {
                result = num1 = num2 = 0;
                str = null;
                opp = null;
                txtOutput.Text = "0";
            }
            else if (b.Text == "sqrt")
            {
                num1 = double.Parse(txtOutput.Text);
                result = Math.Sqrt(num1);
                txtOutput.Text = result.ToString();
            }
            else if (b.Text == "1/x")
            {
                num1 = double.Parse(txtOutput.Text);
                result = 1 / num1;
                txtOutput.Text = result.ToString();
            }
            else if (b.Text == "%")
            {
                num1 = double.Parse(txtOutput.Text);
                result = num1 / 100;
                txtOutput.Text = result.ToString();
            }
            opp1 = "";
        }
    }
}