MFC简单计算器,该如何解决

MFC简单计算器
用MFC编写一个简单计算器，能实现加减乘除运算，

C/C++ code

// calculatorDlg.cpp : implementation file//#include "stdafx.h"#include "calculator.h"#include "calculatorDlg.h"#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 CDialog{public:    CAboutDlg();// Dialog Data    //{{AFX_DATA(CAboutDlg)    enum { IDD = IDD_ABOUTBOX };    //}}AFX_DATA    // ClassWizard generated virtual function overrides    //{{AFX_VIRTUAL(CAboutDlg)    protected:    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support    //}}AFX_VIRTUAL// Implementationprotected:    //{{AFX_MSG(CAboutDlg)    //}}AFX_MSG    DECLARE_MESSAGE_MAP()};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD){    //{{AFX_DATA_INIT(CAboutDlg)    //}}AFX_DATA_INIT}void CAboutDlg::DoDataExchange(CDataExchange* pDX){    CDialog::DoDataExchange(pDX);    //{{AFX_DATA_MAP(CAboutDlg)    //}}AFX_DATA_MAP}BEGIN_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_edit1 = 0.0;    //}}AFX_DATA_INIT    // Note that LoadIcon does not require a subsequent DestroyIcon in Win32    m_hIcon = AfxGetApp()-&gt;LoadIcon(IDR_MAINFRAME);    tempvalue=0;    result=0;    sort=0;    append=0;}void CCalculatorDlg::DoDataExchange(CDataExchange* pDX){    CDialog::DoDataExchange(pDX);    //{{AFX_DATA_MAP(CCalculatorDlg)    DDX_Text(pDX, IDC_EDIT1, m_edit1);    //}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CCalculatorDlg, CDialog)    //{{AFX_MSG_MAP(CCalculatorDlg)    ON_WM_SYSCOMMAND()    ON_WM_DESTROY()    ON_WM_PAINT()    ON_WM_QUERYDRAGICON()    ON_BN_CLICKED(IDC_BUTTON1, OnButton1)    ON_BN_CLICKED(IDC_BUTTON2, OnButton2)    ON_BN_CLICKED(IDC_BUTTON3, OnButton3)    ON_BN_CLICKED(IDC_BUTTON4, OnButton4)    ON_BN_CLICKED(IDC_BUTTON5, OnButton5)    ON_BN_CLICKED(IDC_BUTTON6, OnButton6)    ON_BN_CLICKED(IDC_BUTTON7, OnButton7)    ON_BN_CLICKED(IDC_BUTTON8, OnButton8)    ON_BN_CLICKED(IDC_BUTTON9, OnButton9)    ON_BN_CLICKED(IDC_BUTTONequal, OnBUTTONequal)    ON_BN_CLICKED(IDC_BUTTONclean, OnBUTTONclean)    ON_BN_CLICKED(IDC_BUTTONplus, OnBUTTONplus)    ON_BN_CLICKED(IDC_BUTTONminus, OnBUTTONminus)    ON_BN_CLICKED(IDC_BUTTONmulti, OnBUTTONmulti)    ON_BN_CLICKED(IDC_BUTTONdiv, OnBUTTONdiv)    ON_BN_CLICKED(IDC_BUTTONzero, OnBUTTONzero)    ON_BN_CLICKED(IDC_RADIO9, OnRadio9)    ON_BN_CLICKED(IDC_RADIO10, OnRadio10)    ON_BN_CLICKED(IDC_RADIO11, OnRadio11)    ON_BN_CLICKED(IDC_RADIO12, OnRadio12)    ON_BN_CLICKED(IDC_BUTTONsqrt, OnBUTTONsqrt)    ON_BN_CLICKED(IDC_BUTTONdeciamal, OnBUTTONdeciamal)    //}}AFX_MSG_MAPEND_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CCalculatorDlg message handlersBOOL 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 &lt; 0xF000);    CMenu* pSysMenu = GetSystemMenu(FALSE);    if (pSysMenu != NULL)    {        CString strAboutMenu;        strAboutMenu.LoadString(IDS_ABOUTBOX);        if (!strAboutMenu.IsEmpty())        {            pSysMenu-&gt;AppendMenu(MF_SEPARATOR);            pSysMenu-&gt;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 dialog    SetIcon(m_hIcon, TRUE);            // Set big icon    SetIcon(m_hIcon, FALSE);        // Set small icon        // TODO: Add extra initialization here        return TRUE;  // return TRUE  unless you set the focus to a control}void CCalculatorDlg::OnSysCommand(UINT nID, LPARAM lParam){    if ((nID & 0xFFF0) == IDM_ABOUTBOX)    {        CAboutDlg dlgAbout;        dlgAbout.DoModal();    }    else    {        CDialog::OnSysCommand(nID, lParam);    }}void CCalculatorDlg::OnDestroy(){    WinHelp(0L, HELP_QUIT);    CDialog::OnDestroy();}// 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 CCalculatorDlg::OnPaint() {    if (IsIconic())    {        CPaintDC dc(this); // device context for painting        SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);        // Center icon in client rectangle        int cxIcon = GetSystemMetrics(SM_CXICON);        int cyIcon = GetSystemMetrics(SM_CYICON);        CRect rect;        GetClientRect(&rect);        int x = (rect.Width() - cxIcon + 1) / 2;        int y = (rect.Height() - cyIcon + 1) / 2;        // Draw the icon        dc.DrawIcon(x, y, m_hIcon);    }    else    {        CDialog::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;}void CCalculatorDlg::OnButton1() {    // TODO: Add your control notification handler code hereif(append==1)result=0;result=result*10+1;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnButton2() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+2;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnButton3() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+3;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnButton4() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+4;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnButton5() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+5;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnButton6() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+6;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnButton7() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+7;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnButton8() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+8;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnButton9() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+9;m_edit1=result;append=0;UpdateData(FALSE);    }void CCalculatorDlg::OnBUTTONequal() {    // TODO: Add your control notification handler code here    switch(sort)    {    case 1:        result=result+tempvalue;        break;    case 2:        result=result-tempvalue;        break;    case 3:        result=result*tempvalue;        break;    case 4:        result=result/tempvalue;        break;    }    m_edit1=result;    UpdateData(FALSE);}void CCalculatorDlg::OnBUTTONclean() {    // TODO: Add your control notification handler code here    tempvalue=0;    result=0;    m_edit1=0.0;    UpdateData(FALSE);    }void CCalculatorDlg::OnBUTTONplus() {    // TODO: Add your control notification handler code here    sort=1;    tempvalue=result;    m_edit1=0;    append=1;    }void CCalculatorDlg::OnBUTTONminus() {    // TODO: Add your control notification handler code here    sort=2;    tempvalue=result;    m_edit1=0;    append=1;    }void CCalculatorDlg::OnBUTTONmulti() {    // TODO: Add your control notification handler code here    sort=3;    tempvalue=result;    m_edit1=0;    append=1;    }void CCalculatorDlg::OnBUTTONdiv() {    // TODO: Add your control notification handler code here    sort=4;    tempvalue=result;    m_edit1=0;    append=1;    }void CCalculatorDlg::OnBUTTONzero() {    // TODO: Add your control notification handler code here    if(append==1)        result=0;    result=result*10+0;    m_edit1=result;    append=0;    UpdateData(FALSE);    }void CCalculatorDlg::OnRadio9() {    // TODO: Add your control notification handler code here    m_edit1=sin(result);    UpdateData(FALSE);    }void CCalculatorDlg::OnRadio10() {    // TODO: Add your control notification handler code here    m_edit1=cos(result);    UpdateData(FALSE);    }void CCalculatorDlg::OnRadio11() {    // TODO: Add your control notification handler code here    m_edit1=tan(result);    UpdateData(FALSE);    }void CCalculatorDlg::OnRadio12() {    // TODO: Add your control notification handler code here    m_edit1=log10(result);    UpdateData(FALSE);    }void CCalculatorDlg::OnBUTTONsqrt() {    // TODO: Add your control notification handler code here    m_edit1=sqrt(result);    UpdateData(FALSE);    }void CCalculatorDlg::OnBUTTONdeciamal() {    // TODO: Add your control notification handler code here    if(append==1)result=0;result=result*10+7;m_edit1=result;append=0;UpdateData(FALSE);        }

实现代码如上
但是小数点按钮不知道怎么实现求大神指点

[解决办法]
貌似楼上的说了个。点击小数点后就先获得文本框内的数据，然后继续往里面添加内容吧。这样获得整个double的大小了
[解决办法]
好长啊。。。
[解决办法]
设置一个权值的变量dotpos
初始化dotpos应该大于零的
连续输入5 . 2 的情况
初始化curnum = 0; dotpos =1
输入5 curnum = 5 dotpos = 1
输入小数点时先判断dotpos是否小于等于0，如果是表示已经有一个小数点了，出错，否则dotpos置为0，curnum不做任何操作，值不变，

输入2，因为dotpos<=0表示这个2应该是在出现小数点后面，哪一位就由dotpos确定，将其减一dotpos=-1，权值为10^(-1)，curnum=5+0.2=5.2
这样不论你怎么输，任何时候都可以从curnum得到操作数

MFC简单计算器,该如何解决

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