设计计算器论文

1、南京信息工程大学C+面向对象程序设计课程作业报告设计课题： 计算器的设计 专业班级：自动化2班 学生姓名：学生学号：指导教师：成 绩：二 一一 年 六 月 二十 日计算器的设计一、设计目的学会用MFC设计一个简易计算器，能够求实数的四则运算以及求倒数和平方根，可自己增加功能。二、需求分析系统目标：设计的计算器至少能够进行简单的四则运算和求倒数求反以及开方运算。主体功能：实现简单的四则运算和求倒数求反以及开方运算。开发环境：操作系统：windows XP；编程环境：microsoftvisualC+6.0 。3、 总体设计思路 系统流程图：鼠标单机左键，响应相应的函数选择第一第二个操作数选择所需

2、的运算显示结果 图1（流程图）基本功能划分：1.加法运算2.减法运算3.乘法运算4.除法运算5.求倒数6.求平方根7.求余数8.取反9.Backspace功能10.清零功能11.操作帮助四、详细设计 流程图：创建工程（创建一个对话框应用程序）设计对话框界面设置各控件属性为编辑框连接成员变量为类添加数据成员，初始化构造函数。为所有按钮添加事件对类添加成员函数（更新编辑框）并进行实现实现对各按钮事件的实现图2（流程图）（1）创建工程 启动Microsoft Visual利用AppWizard向导，创建一个工程“Calculator”。选择基本表，Click完成。（2） 设计对话框界面 看到如下界面

3、，Delete删除页面上全部原配控件。 利用MFC自带的控件选项编辑计算器界面 设计的界面如下当然作为“所见即所得”的MFC控件设计，干净整齐的界面是基本要求，界面是否整洁明了甚至会影响用户的心情。各控件的属性设置见下表：表1：各个控件控件类型控件的ID控件的CaptionButtonButtonButtonButtonButtonButtonButtonButtonButtonButtonButtonButtonButtonButtonButtonButtonButtonIDC_Num0IDC_Num1IDC_Num9IDC_DotIDC_SignIDC_SubIDC_MulIDC_DivI

4、DC_ClearIDC_SqrtIDC_ReciIDC_EqualIDC_ModIDC_BackspaceIDC_ClearIDC_Help019.+/-+-*/sqrt1/x=%BackspaceClearHelp（3）为编辑框“IDC_DISPLAY”连接成员变量为编辑框“IDC_DISPLAY”连接一个CString类型的成员变量m_display，用来显示操作数和运算结果。（4） 建立向导（5）这里我把添加的控件消息响应函数列出来，控件消息响应函数具体代码部分。 双击控件，首先从加减乘除开始注释： UpdateData() 是MFC的窗口函数，用来刷新数据的由于我们进行基本运算需要更新

5、数据 所以必须添加这个函数。无独有偶剩下的求余，开平方，清零，取反，Backspace,求倒数 也是大同小异（只是把符号小改一下便可）(6)编译CalculatorDlg.cpp（7）编译CalculatorDlg.h(8)编译、链接、运行程序。5、 系统测试开始界面运行9+3=12运行9-3=6运行9*3=27运行9/3=3运行8 sqrt = 2.828运行 3 取倒数运行9/5求余数运行9 取反输入“98754”点Backspace清除最后一位数“5”利用CE 实现清零功能点击Help ，弹出Help窗口。六、参考文献1、段兴，visual C+ 使用程序100例 北京：人民邮电出版社

6、2002；2、杨永国，Visual C+6.0实用教程 清华大学出版社 2007；七、程序附录CalculatorDlg.cpp / CalculatorDlg.cpp : implementation file/* My Calculator* by Siwenzi */#include "stdafx.h"#include "Calculator.h"#include "CalculatorDlg.h"#include "math.h"#ifdef _DEBUG#define new DEBUG_NEW#und

7、ef THIS_FILEstatic char THIS_FILE = _FILE_;#endif/ CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialogpublic:CAboutDlg();/ Dialog Data/AFX_DATA(CAboutDlg)enum IDD = IDD_ABOUTBOX ;/AFX_DATA/ ClassWizard generated virtual function overrides/AFX_VIRTUAL(CAboutDlg)protected:virtual void

8、DoDataExchange(CDataExchange* pDX); / DDX/DDV support/AFX_VIRTUAL/ Implementationprotected:/AFX_MSG(CAboutDlg)/AFX_MSGDECLARE_MESSAGE_MAP();CAboutDlg:CAboutDlg() : CDialog(CAboutDlg:IDD)/AFX_DATA_INIT(CAboutDlg)/AFX_DATA_INITvoid CAboutDlg:DoDataExchange(CDataExchange* pDX)CDialog:DoDataExchange(pDX

9、);/AFX_DATA_MAP(CAboutDlg)/AFX_DATA_MAPBEGIN_MESSAGE_MAP(CAboutDlg, CDialog)/AFX_MSG_MAP(CAboutDlg)/ No message handlers/AFX_MSG_MAPEND_MESSAGE_MAP()/ CCalculatorDlg dialogCCalculatorDlg:CCalculatorDlg(CWnd* pParent /*=NULL*/): CDialog(CCalculatorDlg:IDD, pParent)/AFX_DATA_INIT(CCalculatorDlg)m_Num

10、= 0.0;/AFX_DATA_INIT/ Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);void CCalculatorDlg:DoDataExchange(CDataExchange* pDX)CDialog:DoDataExchange(pDX);/AFX_DATA_MAP(CCalculatorDlg)DDX_Text(pDX, IDC_Num, m_Num);/AFX_DATA_MAPBEGIN

11、_MESSAGE_MAP(CCalculatorDlg, CDialog)/AFX_MSG_MAP(CCalculatorDlg)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_Num0, OnNum0)ON_BN_CLICKED(IDC_Num1, OnNum1)ON_BN_CLICKED(IDC_Num2, OnNum2)ON_BN_CLICKED(IDC_Num3, OnNum3)ON_BN_CLICKED(IDC_Num4, OnNum4)ON_BN_CLICKED(IDC_Num5, OnNu

12、m5)ON_BN_CLICKED(IDC_Num6, OnNum6)ON_BN_CLICKED(IDC_Num7, OnNum7)ON_BN_CLICKED(IDC_Num8, OnNum8)ON_BN_CLICKED(IDC_Num9, OnNum9)ON_BN_CLICKED(IDC_Add, OnAdd)ON_BN_CLICKED(IDC_Sub, OnSub)ON_BN_CLICKED(IDC_Mul, OnMul)ON_BN_CLICKED(IDC_Div, OnDiv)ON_BN_CLICKED(IDC_Equal, OnEqual)ON_BN_CLICKED(IDC_Sign,

13、OnSign)ON_BN_CLICKED(IDC_Inv, OnInv)ON_BN_CLICKED(IDC_Mod, OnMod)ON_BN_CLICKED(IDC_Sqrt, OnSqrt)ON_BN_CLICKED(IDC_Dot, OnDot)ON_BN_CLICKED(IDC_Clear, OnClear)ON_BN_CLICKED(IDC_Backspace, OnBackspace)ON_BN_CLICKED(IDC_Help, OnHelp)/AFX_MSG_MAPEND_MESSAGE_MAP()/ CCalculatorDlg message handlers/BOOL CC

14、alculatorDlg:OnInitDialog()CDialog:OnInitDialog();/ Add "About." menu item to system menu./ IDM_ABOUTBOX must be in the system command range.ASSERT(IDM_ABOUTBOX & 0xFFF0) = IDM_ABOUTBOX);ASSERT(IDM_ABOUTBOX < 0xF000);CMenu* pSysMenu = GetSystemMenu(FALSE);if (pSysMenu != NULL)CStrin

15、g strAboutMenu;strAboutMenu.LoadString(IDS_ABOUTBOX);if (!strAboutMenu.IsEmpty()pSysMenu->AppendMenu(MF_SEPARATOR);pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);/ Set the icon for this dialog. The framework does this automatically/ when the application's main window is not a

16、dialogSetIcon(m_hIcon, TRUE);/ Set big iconSetIcon(m_hIcon, FALSE);/ Set small icon/ TODO: Add extra initialization herequan2 = 1;dotflag = 0;numflag = 0;return TRUE; / return TRUE unless you set the focus to a controlvoid CCalculatorDlg:OnSysCommand(UINT nID, LPARAM lParam)if (nID & 0xFFF0) = I

17、DM_ABOUTBOX)CAboutDlg dlgAbout;dlgAbout.DoModal();elseCDialog:OnSysCommand(nID, lParam);/ If you add a minimize button to your dialog, you will need the code below/ to draw the icon. For MFC applications using the document/view model,/ this is automatically done for you by the framework.void CCalcul

18、atorDlg:OnPaint() if (IsIconic()CPaintDC dc(this); / device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);/ Center icon in client rectangleint cxIcon = GetSystemMetrics(SM_CXICON);int cyIcon = GetSystemMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (

19、rect.Width() - cxIcon + 1) / 2;int y = (rect.Height() - cyIcon + 1) / 2;/ Draw the icondc.DrawIcon(x, y, m_hIcon);elseCDialog:OnPaint();/ The system calls this to obtain the cursor to display while the user drags/ the minimized window.HCURSOR CCalculatorDlg:OnQueryDragIcon()return (HCURSOR) m_hIcon;

20、/键入 0void CCalculatorDlg:OnNum0() UpdateData();if(dotflag)quan2 *= 10;m_Num += 0 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 0;else m_Num = 0;numflag = 1;UpdateData(FALSE);/键入 1void CCalculatorDlg:OnNum1() UpdateData();if(dotflag)quan2 *= 10;m_Num += 1 / (double)quan2;else if(numflag)m_Num

21、= m_Num * 10 + 1;else m_Num = 1;numflag = 1;UpdateData(FALSE);/键入 2void CCalculatorDlg:OnNum2() UpdateData();if(dotflag)quan2 *= 10;m_Num += 2 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 2;else m_Num = 2;numflag = 1;UpdateData(FALSE);/键入 3void CCalculatorDlg:OnNum3() UpdateData();if(dotflag

22、)quan2 *= 10;m_Num += 3 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 3;else m_Num = 3;numflag = 1;UpdateData(FALSE);/键入 4void CCalculatorDlg:OnNum4() UpdateData();if(dotflag)quan2 *= 10;m_Num += 4 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 4;else m_Num = 4;numflag = 1;UpdateData(FA

23、LSE);/键入 5void CCalculatorDlg:OnNum5() UpdateData();if(dotflag)quan2 *= 10;m_Num += 5 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 5;else m_Num = 5;numflag = 1;UpdateData(FALSE);/键入 6void CCalculatorDlg:OnNum6() UpdateData();if(dotflag)quan2 *= 10;m_Num += 6 / (double)quan2;else if(numflag)m

24、_Num = m_Num * 10 + 6;else m_Num = 6;numflag = 1;UpdateData(FALSE);/键入 7void CCalculatorDlg:OnNum7() UpdateData();if(dotflag)quan2 *= 10;m_Num += 7 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 7;else m_Num = 7;numflag = 1;UpdateData(FALSE);/键入 8void CCalculatorDlg:OnNum8() UpdateData();if(do

25、tflag)quan2 *= 10;m_Num += 8 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 8;else m_Num = 8;numflag = 1;UpdateData(FALSE);/键入 9void CCalculatorDlg:OnNum9() UpdateData();if(dotflag)quan2 *= 10;m_Num += 9 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 9;else m_Num = 9;numflag = 1;UpdateDa

26、ta(FALSE);/键入 +void CCalculatorDlg:OnAdd() UpdateData();num1 = m_Num;cal = '+'numflag = 0;dotflag = 0;quan2 = 1;/键入 -void CCalculatorDlg:OnSub() UpdateData();num1 = m_Num;cal = '-'numflag = 0;dotflag = 0;quan2 = 1;/键入 *void CCalculatorDlg:OnMul() UpdateData();num1 = m_Num;cal = '

27、*'numflag = 0;dotflag = 0;quan2 = 1;/键入 /void CCalculatorDlg:OnDiv() UpdateData();num1 = m_Num;cal = '/'numflag = 0;dotflag = 0;quan2 = 1;/键入 %void CCalculatorDlg:OnMod() UpdateData();num1 = m_Num;cal = '%'numflag = 0;dotflag = 0;quan2 = 1;/键入 =void CCalculatorDlg:OnEqual() Updat

28、eData();num2 = m_Num;switch(cal)case '+': m_Num = num1 + num2; break;case '-': m_Num = num1 - num2; break;case '*': m_Num = num1 * num2; break;case '/': m_Num = num1 / num2; break;case '%': m_Num = (int)num1 % (int)num2; break;numflag = 0;dotflag = 0;quan2 = 1

29、;UpdateData(FALSE);/键入 +/-void CCalculatorDlg:OnSign() UpdateData();m_Num = 0 - m_Num;UpdateData(FALSE);/键入 1/xvoid CCalculatorDlg:OnInv() UpdateData();m_Num = 1 / m_Num;numflag = 0;dotflag = 0;quan2 = 1;UpdateData(FALSE);/键入 sqrtvoid CCalculatorDlg:OnSqrt() UpdateData();m_Num = sqrt(m_Num);numflag

30、= 0;dotflag = 0;quan2 = 1;UpdateData(FALSE);/键入 '.' 小数点void CCalculatorDlg:OnDot() UpdateData();dotflag = 1;m_Num += 0.0;UpdateData(FALSE);void CCalculatorDlg:OnClear() UpdateData();m_Num = 0;num1 = 0;num2 = 0;numflag = 0;dotflag = 0;quan2 = 1;UpdateData(FALSE);/撤销之前键入的数，可以依次撤销所有整数位或小数位void

31、CCalculatorDlg:OnBackspace() UpdateData();static int dotquan = quan2; /一次初始化long temp;if(dotflag && numflag) /撤销小数部分if(dotquan >= 10)temp = (long)(m_Num * dotquan);m_Num= (double)(temp/10);dotquan /= 10;m_Num= m_Num / dotquan;else /撤销整数部分if(numflag && m_Num) m_Num = (long)m_Num /1

32、0;UpdateData(FALSE);/帮助提示void CCalculatorDlg:OnHelp() const char tipname="My Calculator Help by Siwenzi"MessageBox("tMy Calculatortby Siwenzinn 文本编辑框，用于输入和输出，接受粘贴或键盘输入。n Backspace功能类似键盘的Backspace键，用于撤销之前键入的数值，可以依次撤销所有整数位或小数位。 n CE为清零键,%为取余运算键，sqrt为开方运算键，+/-用于改变数的正负符号，1/x用于求倒数。n 感谢使用！&

33、quot;,tipname);CalculatorDlg.h/ CalculatorDlg.h : header file/#if !defined(AFX_CALCULATORDLG_H_CB0AD658_C66E_4A7B_AD98_76331DD0BA2A_INCLUDED_)#define AFX_CALCULATORDLG_H_CB0AD658_C66E_4A7B_AD98_76331DD0BA2A_INCLUDED_#if _MSC_VER > 1000#pragma once#endif / _MSC_VER > 1000/ CCalculatorDlg dialog

34、class CCalculatorDlg : public CDialog/ Constructionpublic:CCalculatorDlg(CWnd* pParent = NULL);/ standard constructor/ Dialog Data/AFX_DATA(CCalculatorDlg)enum IDD = IDD_CALCULATOR_DIALOG ;doublem_Num;/AFX_DATAdouble num1,num2; /第一、二操作数char cal; /运算符号BYTE dotflag; /小数点标志BYTE numflag; /键入数字标志long quan2; /小数部分权值