結果顯示及相關備注：

結果顯示

結果顯示

組件名稱注釋

代碼：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace Calculator
{
    public partial class CalcForm : Form
    {
        private string strOutput = "";
        private double lNumFormer = 0;//前一個操作數(shù)
        private double lNumTemp = 0;//臨時變量
        private double lResult = 0;//結果
        private char cOperator;//操作符
        private bool bDotClicked = false;//用于標記小數(shù)點是否被按下
        //private uint decimalIndex = 0;//用于標記當前小數(shù)點后精度位數(shù)欢际，如3.14的decimalIndex==2
        double lastDecimalNum = 1;//最近一次點擊的小數(shù)精度，即小數(shù)最后一位精度糊识，如0.01

        public CalcForm()
        {
            InitializeComponent();
            //數(shù)字按鈕0~9
            EventHandler eh = new EventHandler(Numbers_Click);
            button_num_0.Click += eh;
            button_num_1.Click += eh;
            button_num_2.Click += eh;
            button_num_3.Click += eh;
            button_num_4.Click += eh;
            button_num_5.Click += eh;
            button_num_6.Click += eh;
            button_num_7.Click += eh;
            button_num_8.Click += eh;
            button_num_9.Click += eh;

            //運算符+惯豆、-迫靖、*、/
            EventHandler eh2 = new EventHandler(Operators_Click);
            button_add.Click += eh2;
            button_sub.Click += eh2;
            button_mul.Click += eh2;
            button_div.Click += eh2;
        }

        private void CalcForm_Load(object sender, EventArgs e)
        {

        }
        //****數(shù)字按鈕0-9
        private void button_num_0_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_1_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_2_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_3_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_4_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_5_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_6_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_7_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_8_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        private void button_num_9_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Numbers_Click（）函數(shù)
        }

        //****操作符+、-背桐、*、/
        private void button_add_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Operators_Click（）函數(shù)
        }

        private void button_sub_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Operators_Click（）函數(shù)
        }

        private void button_mul_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Operators_Click（）函數(shù)
        }

        private void button_div_Click(object sender, EventArgs e)
        {
            //功能實現(xiàn)代碼位于Operators_Click（）函數(shù)
        }


        //****等于號=
        private void button_enter_Click(object sender, EventArgs e)
        {
            try
            {
                switch (cOperator)
                {
                    case '+':
                        //計算并檢測數(shù)據(jù)是否越界
                        checked { lResult = lNumFormer + lNumTemp; }
                        break;
                    case '-':
                        checked { lResult = lNumFormer - lNumTemp; }
                        break;
                    case '*':
                        checked { lResult = lNumFormer * lNumTemp; };
                        break;
                    case '/':
                        checked { lResult = lNumFormer / lNumTemp; };
                        break;
                }
            }
            catch
            {
                MessageBox.Show("運算結果溢出");
            }

            txtOutput.Text = lResult.ToString();
            //清空變量
            lNumFormer = 0;//前一個操作數(shù)
            lNumTemp = 0;//臨時變量
            lResult = 0;//結果
            cOperator = '\0';//操作符
            strOutput = "";
            bDotClicked = false;
            lastDecimalNum = 1;
        }

        //****清空鍵CE
        private void button_ce_Click(object sender, EventArgs e)
        {
            //清空變量
            lNumFormer = 0;//前一個操作數(shù)
            lNumTemp = 0;//臨時變量
            lResult = 0;//結果
            cOperator = '\0';//操作符
            strOutput = "";
            bDotClicked = false;
            lastDecimalNum = 1;

            //清空頁面顯示
            txtOutput.Text = "";
        }

        //****小數(shù)點.
        private void button_dot_Click(object sender, EventArgs e)
        {
            if (!bDotClicked)
            {
                strOutput += ".";
                txtOutput.Text = strOutput;
                bDotClicked = true;
            }
        }

        //集中處理按鈕點擊事件
        //****數(shù)字按鈕0-9
        private void Numbers_Click(object sender, EventArgs e)
        {
            string strClickNum = ((Button)sender).Text;
            try
            {
                if (bDotClicked)
                {
                    //得出點擊的小數(shù)數(shù)值
                    //decimalIndex++;
                    lastDecimalNum *= 0.1;
                    checked { lNumTemp = lNumTemp + long.Parse(strClickNum) * lastDecimalNum; }
                }
                else
                {
                    checked { lNumTemp = lNumTemp * 10 + long.Parse(strClickNum); }
                }
            }
            catch
            {
                //貌似double型并不會輕易溢出
                MessageBox.Show("數(shù)據(jù)溢出");
            }
            txtOutput.Text = lNumTemp.ToString();
            strOutput += strClickNum;
            //strOutput = lNumTemp.ToString();
            txtOutput.Text = strOutput;
        }

        //集中處理按鈕點擊事件
        //****操作符+蝉揍、-链峭、*、/
        private void Operators_Click(object sender, EventArgs e)
        {
            string strClickOp = ((Button)sender).Text;
            cOperator = strClickOp[0];//strClickOp長度為1
            lNumFormer = lNumTemp;
            lNumTemp = 0;
            strOutput += cOperator.ToString();
            txtOutput.Text = strOutput;
            bDotClicked = false;
            lastDecimalNum = 1;
        }

        //鍵盤按鍵
        protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            // if it is a hotkey, return true; otherwise, return false
            switch (keyData)
            {
                case Keys.NumPad0:
                    button_num_0.Focus();
                    button_num_0.PerformClick();
                    return true;
                case Keys.NumPad1:
                    button_num_1.Focus();
                    button_num_1.PerformClick();
                    return true;
                case Keys.NumPad2:
                    button_num_2.Focus();
                    button_num_2.PerformClick();
                    return true;
                case Keys.NumPad3:
                    button_num_3.Focus();
                    button_num_3.PerformClick();
                    return true;
                case Keys.NumPad4:
                    button_num_4.Focus();
                    button_num_4.PerformClick();
                    return true;
                case Keys.NumPad5:
                    button_num_5.Focus();
                    button_num_5.PerformClick();
                    return true;
                case Keys.NumPad6:
                    button_num_6.Focus();
                    button_num_6.PerformClick();
                    return true;
                case Keys.NumPad7:
                    button_num_7.Focus();
                    button_num_7.PerformClick();
                    return true;
                case Keys.NumPad8:
                    button_num_8.Focus();
                    button_num_8.PerformClick();
                    return true;
                case Keys.NumPad9:
                    button_num_9.Focus();
                    button_num_9.PerformClick();
                    return true;
                case Keys.Add:
                    button_add.Focus();
                    button_add.PerformClick();
                    return true;
                case Keys.Subtract:
                    button_sub.Focus();
                    button_sub.PerformClick();
                    return true;
                case Keys.Multiply:
                    button_mul.Focus();
                    button_mul.PerformClick();
                    return true;
                case Keys.Divide:
                    button_div.Focus();
                    button_div.PerformClick();
                    return true;
                case Keys.Enter:
                    button_enter.Focus();
                    button_enter.PerformClick();
                    return true;
                case Keys.Escape:
                    button_ce.Focus();
                    button_ce.PerformClick();
                    return true;
                case Keys.Decimal:
                    button_dot.Focus();
                    button_dot.PerformClick();
                    return true;
                default:
                    break;
            }
            return base.ProcessCmdKey(ref msg, keyData);
        }

        private void txtOutput_TextChanged(object sender, EventArgs e)
        {

        }
    }
}

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