MFC實(shí)現(xiàn)簡易計(jì)算器

1、MFC實(shí)現(xiàn)簡易計(jì)算器©Free Copy操作簡便，還有幫助提示，支持double類型的數(shù)據(jù)進(jìn)行運(yùn)算，顯示清除無效0.By: 杜運(yùn)福 計(jì)算器類結(jié)構(gòu)如下：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 num

2、1,num2; /第一、二操作數(shù)char cal; /運(yùn)算符號BYTE dotflag; /小數(shù)點(diǎn)標(biāo)志BYTE numflag; /鍵入數(shù)字標(biāo)志long quan2; /小數(shù)部分權(quán)值/ ClassWizard generated virtual function overrides/AFX_VIRTUAL(CCalculatorDlg)protected:virtual void DoDataExchange(CDataExchange* pDX);/ DDX/DDV support/AFX_VIRTUAL/ Implementationprotected:HICON m_hIcon;/ Ge

3、nerated message map functions/AFX_MSG(CCalculatorDlg)virtual BOOL OnInitDialog();afx_msg void OnSysCommand(UINT nID, LPARAM lParam);afx_msg void OnPaint();afx_msg HCURSOR OnQueryDragIcon();afx_msg void OnNum0();afx_msg void OnNum1();afx_msg void OnNum2();afx_msg void OnNum3();afx_msg void OnNum4();a

4、fx_msg void OnNum5();afx_msg void OnNum6();afx_msg void OnNum7();afx_msg void OnNum8();afx_msg void OnNum9();afx_msg void OnAdd();afx_msg void OnSub();afx_msg void OnMul();afx_msg void OnDiv();afx_msg void OnEqual();afx_msg void OnSign();afx_msg void OnInv();afx_msg void OnMod();afx_msg void OnSqrt(

5、);afx_msg void OnDot();afx_msg void OnClear();afx_msg void OnBackspace();afx_msg void OnHelp();/AFX_MSGDECLARE_MESSAGE_MAP();完整實(shí)現(xiàn)代碼如下：/ CalculatorDlg.cpp : implementation file/* 簡易計(jì)算器* by 追夢 2011-4-18*/#include "stdafx.h"#include "Calculator.h"#include "CalculatorDlg.h"

6、#include "math.h"#ifdef _DEBUG#define new DEBUG_NEW#undef 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

7、 function overrides/AFX_VIRTUAL(CAboutDlg)protected:virtual void 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 CAbou

8、tDlg:DoDataExchange(CDataExchange* pDX)CDialog:DoDataExchange(pDX);/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

9、(CCalculatorDlg:IDD, pParent)/AFX_DATA_INIT(CCalculatorDlg)m_Num = 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_MA

10、P(CCalculatorDlg)DDX_Text(pDX, IDC_Num, m_Num);/AFX_DATA_MAPBEGIN_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, O

11、nNum3)ON_BN_CLICKED(IDC_Num4, OnNum4)ON_BN_CLICKED(IDC_Num5, OnNum5)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

12、, OnDiv)ON_BN_CLICKED(IDC_Equal, OnEqual)ON_BN_CLICKED(IDC_Sign, 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_

13、MSG_MAPEND_MESSAGE_MAP()/ CCalculatorDlg message handlers/BOOL CCalculatorDlg: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);C

14、Menu* pSysMenu = GetSystemMenu(FALSE);if (pSysMenu != NULL)CString 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 thi

15、s automatically/ when the application's main window is not a 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 CCalculatorD

16、lg:OnSysCommand(UINT nID, LPARAM lParam)if (nID & 0xFFF0) = IDM_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,/

17、 this is automatically done for you by the framework.void CCalculatorDlg: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 = GetSyste

18、mMetrics(SM_CYICON);CRect rect;GetClientRect(&rect);int x = (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.

19、HCURSOR CCalculatorDlg:OnQueryDragIcon()return (HCURSOR) m_hIcon;/鍵入 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);/鍵入 1void CCalculatorDlg:OnNum1() UpdateData();if(dotf

20、lag)quan2 *= 10;m_Num += 1 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 1;else m_Num = 1;numflag = 1;UpdateData(FALSE);/鍵入 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

21、(FALSE);/鍵入 3void CCalculatorDlg:OnNum3() UpdateData();if(dotflag)quan2 *= 10;m_Num += 3 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 3;else m_Num = 3;numflag = 1;UpdateData(FALSE);/鍵入 4void CCalculatorDlg:OnNum4() UpdateData();if(dotflag)quan2 *= 10;m_Num += 4 / (double)quan2;else if(numfla

22、g)m_Num = m_Num * 10 + 4;else m_Num = 4;numflag = 1;UpdateData(FALSE);/鍵入 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);/鍵入 6void CCalculatorDlg:OnNum6() UpdateData();if

23、(dotflag)quan2 *= 10;m_Num += 6 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 6;else m_Num = 6;numflag = 1;UpdateData(FALSE);/鍵入 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;Updat

24、eData(FALSE);/鍵入 8void CCalculatorDlg:OnNum8() UpdateData();if(dotflag)quan2 *= 10;m_Num += 8 / (double)quan2;else if(numflag)m_Num = m_Num * 10 + 8;else m_Num = 8;numflag = 1;UpdateData(FALSE);/鍵入 9void CCalculatorDlg:OnNum9() UpdateData();if(dotflag)quan2 *= 10;m_Num += 9 / (double)quan2;else if(n

25、umflag)m_Num = m_Num * 10 + 9;else m_Num = 9;numflag = 1;UpdateData(FALSE);/鍵入 +void CCalculatorDlg:OnAdd() UpdateData();num1 = m_Num;cal = '+'numflag = 0;dotflag = 0;quan2 = 1;/鍵入 -void CCalculatorDlg:OnSub() UpdateData();num1 = m_Num;cal = '-'numflag = 0;dotflag = 0;quan2 = 1;/鍵入 *

26、void CCalculatorDlg:OnMul() UpdateData();num1 = m_Num;cal = '*'numflag = 0;dotflag = 0;quan2 = 1;/鍵入 /void CCalculatorDlg:OnDiv() UpdateData();num1 = m_Num;cal = '/'numflag = 0;dotflag = 0;quan2 = 1;/鍵入 %void CCalculatorDlg:OnMod() UpdateData();num1 = m_Num;cal = '%'numflag =

27、 0;dotflag = 0;quan2 = 1;/鍵入 =void CCalculatorDlg:OnEqual() UpdateData();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

28、 = (int)num1 % (int)num2; break;numflag = 0;dotflag = 0;quan2 = 1;UpdateData(FALSE);/鍵入 +/-void CCalculatorDlg:OnSign() UpdateData();m_Num = 0 - m_Num;UpdateData(FALSE);/鍵入 1/xvoid CCalculatorDlg:OnInv() UpdateData();m_Num = 1 / m_Num;numflag = 0;dotflag = 0;quan2 = 1;UpdateData(FALSE);/鍵入 sqrtvoid CCalculatorDlg:OnSqrt() U